I get the same problem(I'm 5'8, 120) and after 27yrs I don't give a fuck anymore. I just cuss out the people who feel the need to make a comment.

Most of the time I'll come right back and make a comment about their fat selves. One time I grabbed a dudes man boobs and jiggled them while telling him off because his fat ass had the nerve to say I was too skinny. I had to remind him I'm in shape and athletic.....you have manboobs......who here really has a problem with weight?