I think it is like anything else, there are always going to be some people who think things should be a certain way and if it is not that way, then they think it is fake or wrong or something. I have always thought people who think that way are not worth getting mad over.

It also may just be that some people are so involved with being either a top or a bottom that switching seems unthinkable to them. It may not be that they are intentionally being insulting or anything of that sort.