When the matter of the leadership of the Babis was brought forth, Bahaullah labeled his brother - Mirza Yahya Subhe Azal, who according to the will of the Bab, was his successor - with all kinds of profanities. He revealed all the inner secrets between them and tried his best to ruin his reputation. He even went so far as calling him, and all the rest of his deniers, donkeys, cows, and dung beetles:

Oh you donkeys! Whatever God says is the truth and will not become void by the words of the polytheists.
Bahaullah, Badi`, p. 174

Oh followers of Baha . . . let these bogus dung-beetle like bodies to be occupied with their filthy dirty stinky beliefs. By my true self, the nose of the cow has no share from this purified perfume.
Bahaullah, Iqtidarat wa chand lauhe digar, p. 58

Have in mind that that this degree of politeness emanates from the same Bahaullah that says:
Politeness is one of mankind’s traits that distinguishes him from other [creatures]. He who has no success in [being polite] then his demise certainly has - and will have - priority over his existence.
Bahaullah, Badi`, p. 203-204

According to Bahaullah, it is better for someone who is impolite and rude to cease to exist than continue living in their current state. Fazil Mazandarani has collected a list of rude titles that Bahaullah had given to his brother. We will mention a number of these below:

When Mirza Yahya Azal started opposing the works, deeds, and words of his esteemed brother (Bahaullah) in Edirne (A city in northwestern Turkey). . . he dropped down from his [high] stature and the rank of union and agreement [that he had with Bahaullah] and was gradually - in the tablets, works, and revelations [from Bahaullah] - referred to with codes, references, and names such as the polytheist, the calf, the scarab (dung beetle), the tyrant, the Satan, the devil, the foul swamp, the buzzing of a fly, and similar names.
Asad-Allah Fazil Mazandarani, Asrar al-athar khususi, vol. 5, p. 345-346

Regardless of his own impolite style and context, Bahaullah recommends Baha’is not to be rude: Oh Party of God! I recommend you to be polite, for the first status of [politeness] is that it is the chief of morality. Blessed is the person that is illuminated by the light of politeness and decorated with the style of honesty. The holder of politeness has a great rank. It is hoped that this oppressed one (meaning Bahaullah) and all be successful in it, adhere to it, cling to it, and be witness to it. This is the firm decree that has flown from the pen of the Great Name and has been revealed.
Riyaz Qadimi, Gulzar-i ta`alim Baha’i, p. 25

Oh followers of Baha! You were - and are - the starting point of affection and the beginning place of divine favors. Do not stain your tongue by swearing and cursing . . . do not be the cause of sadness.
Abd al-Hamid Ishraq Khawari, Ganjiniy-i Hudud wa ahkam, chap. 47, p. 322

Apparently double standards and hypocrisy are approved of in this creed.

Bahaullah - not knowing that in the future, his children would follow the footsteps of their father and uncle - wrote in a proselytizing letter:
Politeness is my shirt that we will use to decorate our favored servants.
Riyaz Qadimi, Gulzar-i ta`alim Baha’i, p. 25

Abdul Baha and Muhammad Ali Effendi (Bahaullah’s other son) inherited their father’s manners and similarly showed no respect to each other over the succession of their father. Matters reached the point where Abdul Baha crowned his brother and his followers with titles such as flies, dung-beetles, earthworms, bats, ravens, and foxes.
"They are senile like arrogant fools and not seashells full of gems. They are ecstatic from the smell of garbage like dung beetles and not from the scent of a flower of gardens. They are lowly earthworms buried beneath the great earth not high flying birds. They are bats of darkness not the searchlights of clear horizons. They always make excuses and like ravens, have nested in the landfills of fall (autumn) . . . so you Oh true friend and spiritual helper . . . attack these unjust foxes and like a high soaring eagle drive away these hateful ravens from this field," `Abdu’l-Baha, Makatib (Egypt), vol. 1, pp. 442-443

We too agree with Bahaullah that "woe be upon he who is deprived of politeness."
"We chose politeness and made it the trait of those [we] favor. It is a cloth which fits the body of all, big or small. Salvation is for he who makes it cover his body. Woe is for him who is deprived of this great virtue," Riyaz Qadimi, Gulzar-i ta`alim Baha’i, p. 25

We also agree with Abdul Baha when he says: We should be fair. How can we expect a person that has failed in nurturing his children, spouse, and family to succeed in nurturing the people of the world? Is there any doubt or uncertainty about this issue? By God, no!
Abdul-Baha, Makatib (Egypt), vol. 2, p. 182.

• Oneness of Mankind: Introduction
• Is Oneness of Mankind a New Principle?
• Did the Founders of Bahai Faith Practice Oneness?
• Bahaullah's Attitute towards his Brothers and his Followers
• Bahai Treatment of Covenant Breakers
• Bahai Treatment of Thieves and Some More...
• Two Examples of Bahaullah's Treatment of Non-Bahais
• Is this Principle Correct from a Rational and Logical Perspective
• Contradictions and Conclusions

The articles have been based on the book "Avaze Dohol" - the Beating of the Drum by Masoud Basiti, Zahra Moradi.