Damn, over sensitive fans. So your favorite celebrity did some B grade film. Get real. It's a part of their life, deal with it. They didn't become any lesser or greater due to it. There's nothing to be embarrassed or ashamed about. It's a job. Quit acting as if it was bloody murder and getting the record sealed.
When someone brings up a B grade film past, you have a choice – be nonchalant and accept facts or get upset over it. When you get upset over it, it is not the one who brings it up – but you as a fan who degrades your own favorite by being ashamed over their past. No one can degrade a celebrity unless fans themselves accept something is degrading.