There are some people who view bonsai as a competition sport. It is not my thing - but I don't begrudge them enjoying the hobby in that way. They just get frustrated if you won't play their game
I don't view them as "nasty", just playing a competitive game of verbal oneupmanship. As people have pointed out, they are probably very nice people if you met them face to face. If you don't like them, put them on ignore
Same thing with scuba diving, mountain biking, running, and every other pastime I enjoy. Some people do it for the competition. I do it for the pleasure and the peace of spirit. My competition is on the inside
Maybe it is the sign of a huge ego
I don't care about your opinion until you demonstrate why I SHOULD care