I disagree. People like that tend to drive other people away from games. If the atmosphere is toxic, new players are going to feel completely unwelcome and abandon the game. They may also talk about their terrible experience, thus driving away more people who won't even give the game a chance because they don't want to deal with it.
Honestly, I think this guy is using the wrong term here. For most of us, 'Toxic' are the people who swear every other word, insult new players, sling racial and sexual slurs around, and basically just make the entire game completely unfriendly. It sounds like the the type of people this guy is talking about are die-hard fans, the ones that will still buy a Sonic or Mario game even though they already know it's not going to be good.