I used to think people were generally nice, but in the last 5 years I notice that there are a large number of deeply unpleasant people these days. Maybe those people were never given a platform in the past, or maybe there's a problem with discipline in schools these days... whatever.
Do what Nintendo does - stay well away from online multiplayer where you need to interact with people you don't know. Most of the players are probably 11 year old kids anyway.