Good luck finding anything in the world with a generally "mature" player/user/member base. People on average are going to be bad, it's up to you to pull the weeds or migrate to greener pastures.
Games that require a significant hardware investment tend to attract older folks; iRacing, many flight simulators.
I'd suggest finding a game that doesn't involve any sort of competitive play --- in my experience, that tends to bring out the worst in people unfortunately.
Or at least, a game where you can almost entirely avoid the directly competitive modes of play.
For example, in Guild Wars 2, players are always working together in the main PVE theatre. Players can't attack or grief one another in any way. You can't "steal" someone's resource node, or ninja tag an enemy they're waiting for. I've never seen any outbursts of rage and abuse in the chat channels of that game, which is a welcome change from your typical MMO.
I actually have a somewhat positive view of the community, I typically see only 1 person rage per 3-5 matches when doing ranked (which is really not much when you consider that is potentially 27-45 different people). It also probably helps that I'm a fairly insensitive person, so comments that others might consider rude don't strike me as such.
It should be more than tingling. It should be rock hard at this point.
Star Citizen isn't out yet, but for the most part people seem to be really mature. You see very little complaining when they release something with bugs, most people are on the forums giving feedback instead of crying, and people are very upbeat about the "open development" concept.