Quick.Concise.Advice
Dtube and Steemit has been a friendly atmosphere and a good starting point for new bloggers/vloggers.
Reddit, Youtube and other online platforms have some awful trolls. No matter how hard you dis them or outwit them, they come back for more and even use abusive language with your subscribers/followers or start online quarrels with everyone.
Ignoring them is the best solution.
Best to go with the approach of blocking them or banning them. >>> Out of sight, Out of mind.