I Don't Like Disrespectful People

Online, I have seen various posts that have been targeted with negative and hurtful comments from strangers who don't even know them. Maybe the individual's personality is a certain way and they can't really help it or they have their sinister cyber communication down to a science.
I had one guy write me a mail who thought I 'seemed lonely and wanted attention.' It's as though they look for clues that someone is naive and easily trick. No, I'm not. I don't intend to lose my identity online by being duped by others in thinking they know all about me when really they know nothing at all and never will.