Upvoted!

I calmly stand in front of that person look them clear in the eye and smile and while smiling I firmly and politely say "I'm not sure what it is that you are trying to achieve by being rude to me but I want you to know I'm not going to play your mind games!! (Especially if they have an audience which they usually manufacture to crank up their intimidation value).

It turns the table and the effect for them is unpleasant and they will not risk you repeating the put down with it's associated humiliation value. It has worked for me many times.