Even if someone say you are a nazi troll? 
Are you insinuating that I'm not?
Whatever. The last refuge of a coward has always been and will continue to be name-calling and attempting to portray your adversary as the most evil thing you can think of. It says more about the accuser's inability to defend his actions than anything else. But, you do make a good point; ignoring such obtuse idiots is probably the best course of action.
Ideally, if you're an active reporter and want to use the ignore function, you can report a few posts by a shitposter and then put that member on ignore. After that, you've done your part and the person is either going to get banned or they're not. It wouldn't make sense to keep reporting their posts if the mods aren't going to take action.
I hear ya, it can be irritating to see obvious shit posting trolls run rampant. But I think persistence can pay off eventually. Recently there was that viral freak who had an ax to grind with facebook. It took making a threat before he finally got banned. Somebody must have reported that post, and I'm glad that it was. If the reporter had the account on ignore that post may have gone unreported. That's probably not the best example, but you catch my drift.