Hey, if you're looking for streamers who won't come out with racism during a "heated gaming moment", here are a few on Twitch that I like:

DistractedElf
Day9tv
Bluejay
RissaRants
LobosJr
INeedDivGames
FuzzyFreaks
SimplyUndrea
Drewmega
GamingOnLinux
LetsIntelligame
8BitDylan

I've never heard anything racist, or indeed overtly sexist, transphobic, etc. out of a single one of them. Most of them run tight ships in their chat too.

@Nezchan Been watching the Day9 learns DotA series and it's amazing how much positivity that guy radiates even when a game is going disastrously badly.

@salameleon He's a really positive guy in general. Talks a lot about statistics and is only too willing to pass on his experience about being a streamer since the early days.

LobosJr is kinda similar in being positive in the face of terrible gaming experiences. He does a lot of Dark Souls (and other games) challenge runs, and there are times he just goes after a boss again and again, all with a smile and ready patter.