How ad hominem attacks work:
Person A says "x"
Person B points out that person A doesn't know squat about "x" and asks for some proof of the statment
Person A says that he's being attacked and refuses to provide any evidence to back up his statment. If pressed he'll direct you to a youtube video. Personally I'm surprised some of these people can read and write well enough to post on the internet. Direct me to something at the library and I might take you seriously.