A rant is a long, angry, and often illogical speech. It's often used to describe someone who is expressing their frustration or anger in a loud and uncontrolled way. In the context of sales, a final slur and tirade would be considered a rant, especially if it's directed at a customer or colleague.
Other words you could use to describe this behavior include:
* Tirade: A long, angry speech.
* Diatribe: A bitter and abusive speech.
* Harangue: A lengthy and aggressive speech.
* Outburst: A sudden and forceful expression of emotion.
It's important to note that using any of these words implies that the speech is inappropriate and potentially offensive. It's always best to try to resolve conflicts in a calm and respectful manner.