Let Streamers dictate their own community etiquette and guidelines.
Telling every community without a question on what terms and usages in their own communities are disallowed, aside from a few exceptions that can mean nothing but hateful things, is a little ridiculous. People come from different cultures and accept different things. Streamers should be able to create their own guidelines and 'accepted vocabulary' in their own community.
These guidelines would of course be required to be displayed fully on their about pages so people who would not be able to handle more 'lax' communities can avoid joining in such places. Something they of course have every right to do. This would allow people to not be surprised with such things, and also create a much more relaxed, stress-free community feeling between people who are clearly friendly with eachother and don't mean any sort of hate or harm with the things they're saying.
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LolsonX commented
It could be even more interesting solution if user could manage how it behaves, like some opt-in solution that User need to mark that he allows for such content so theese streams could be promoted for such people