It's a trigger for me.... it reminds me of my brother. He was right there all the time.... getting into my head. I ignored it, and he just kept on doing it... until I was ready to snap. and I did.. when we were kids, I broke my hand punching him (I aimed for his gut, and hit him in the hip).

It still enrages me to think of his behavior.

I feel defenseless when people mock me without cause (is there ever a time to mock someone?).

Then there were the questions. Are you ignoring me? Why are you ignoring me? Is it because of ____? You hate me, don't you? You hate me because ____.

I think in that situation... the best thing to do would have been a way to make it painful for him, without saying or doing anything that I would regret later.

I did once come up with a response that obviously bothered him. I told me that he reminded me of a mosquito, buzzing around my ear. I suspect that when I belittled him with a measured response it bothered him. It's like I was telling him in measured tones, that "yes, I hear you, but you have to realize your opinion isn't that important to me."