Agreed, and it is never okay for anyone to have a laugh at the expense of someone else.

There have been times when I have "fought back" a bit by trying to out-do, out-wit or even shame the other person, but that has seldom been successful in changing anyone's view of me as a vulnerable target for having a laugh. So in some cases, I have had to simply stay away from certain people, places or situations.

In certain other cases, I have had to learn to be able to laugh at myself a bit...such as after having said or done something odd or unexpected by others after I had misunderstood something. And then along with that, there have been times when I have even played the part of a social clown in one situation or another so I can control others' laughter at me.

Another thing I have done along that same kind of line is to observe some silly or unusual things other people have said or done and to then get a laugh by doing the same at an appropriate time so other people can get a chuckle without my ever having "poked fun" at anyone else. For example: I once heard someone speak of something as an "optical delusion" where he had meant to be talking about an optical illusion, and I have since often said things such as "Hey, look at the optical delusion over there!" and then laughed along with others who laughed at what I had just said.