It's not about being unable to handle people's dickery so much as it is about deciding to not tolerate it any longer. Trash talk is all fine and well and vitriol is pretty much unavoidable in any online game but what went down in that stream chat was genuinely horrible. That kind of behavior isn't okay and has never been okay. Speaking out against it doesn't make anyone less of an adult, it simply means that you don't condone the behavior.