I'm lucky that my content generally targets and attracts an older audience. Granted my channel is still very small but I've never had anyone troll or spam or anything like that, everyone seems level-headed and mature enough to handle themselves. I've had a few people say negative things about the video, but since it's on-topic and actually about the content, I'm fine with it. People commenting have a right to criticize what they don't like, and I just take it as something to consider moving forward with my content.