Slow games are more satisfying (and you're more able to control the outcome) but of course not as convenient as online chess.
Anyway, if you do play speed games online, have to be prepared for trash talking... which certainly isn't something unique to chess.
At least on chess.com you can disable chat and not let non-friends post in your notes.
The people who play ( edited by moderator-language) at it on this site and play mind games to try and win games including flagging and boasting about how intelligent they are over their rating.
It's a joke.
Chess doesn't prove anything period. It's just another game.
There's no IQ basis for chess as much as anything else.