Some people are just haters. When you respond to them, they get some sort of sick feedback. The best thing to do is just ignore them. I don't really think it matters who you are, you are going to get negative feedback.
There are a lot of Numb-nuts out there Mike. If You want to be on YouTube You need to get a thick skin. If they post crap about You, or what You have done, just block them. If they really get sideways, report them to YouTube. You are doing a good job Mike, and You will find a style that fits You in time.