."Speak when you are angry, and you will make the best speech that you will ever regret." -- Ambrose Bierce

I spoke to a mailman one day and he was reluctant to get too close to the door because he had a close call with a pitbull. Yes, we have a border collie, a very docile dog. He explained to me that if that pitbull would have assaulted him, he (the mailman) would still been at fault for the assault. That is the way it is in life especially at a work-related situation. In the workplace, it is important to behave professionally at all times. It is true that we cannot speak or yell at a dog and have the dog comprehend an insulting speech, but sometimes you can do everything correct and there is still a trouble-maker at work. The best solution for this situation is to ignore the situation, or you should suck it up because "speak when you are angry, and you will make the best speech that you will ever regret," (Ambrose Bierce)
It is important to make a commitment to yourself to do things that will enhance your self-esteem, but a lot of times, the boss will believe the trouble-maker. The trouble-maker explains the ugly speech you gave and there goes your job out the window. It doesn't happen all the time, but the truth does come out. The problematic person will get caught. Hopefully, next time the boss will choose to believe the non-problematic person.