Why are you in the groups you are in?

I just had some guy come to me and say "so you are a witch"....I have never seen or spoke to this guy before so i was rather taken aback. He made the assumption that everyone in any group, let's say witches, is a witch. I tried to get this guy to not make assumptions and to think before he speaks...because people join groups for their own personal reasons. lets say the witchcraft group...a person may join because they are one, or were one, or want to become one, or have an interest in, or are doing research on, or are curious...it doesnt mean everyone in there is one. He got so snarky and impolite then blew me off saying "well this isnt going anywhere", and proceeded to block me. Pity ...of course he didnt read my other groups or he would have known i would have put him in his place on so many levels. This guy claims he is a "master" and is looking for subs..his profile says he is 26+ but based on his behaviour, he is far younger and is only a wanna be master and doesnt have a clue how to be one...online or off. As I told him...get to know the person you approach, by talking to them, before you pop off with assumptions and off putting behaviour. sorry, just had to vent...