Out of those three, that one is also the easiest to fix (or at least, least effort to combat): don't reply to them, ignore them, kick them out from you communit

Out of those three, that one is also the easiest to fix (or at least, least effort to combat): don't reply to them, ignore them, kick them out from you community with a warning or simply ban them. Most communication tools support those patterns, use them if you find it draining. Just because you publish open source code doesn't mean you owe the users of that software anything.