Why do anti-feminists lump all feminists together, yet complain when feminists do this to them?

I think you have greatly missed the point and provided us with a very rationalized question. The key to your question is the word "anti". You will notice that the people you call "anti-feminist" refer to you as a feminist or a female. They do not refer to you as "anti-masculines" or "anti-male". You create an automatic argument with your speech by calling people anti-whatevers. Maybe it is you who should drop the negative prefixes.