I don't worry much about insults or I'd never gotten on, but it's just the internet. When that's all that's involved, most people with something else to do move on.
Unanswered accusations stand on their own, depending on the poster. It doesn't take long to figure out the credibility of a poster who's been around a while.
"Be sure you're right. Then go ahead." Fess Parker as Davy Crockett
