Well, for a question asking for factual answers, if an answer is wrong I usually report it as "nonsense". If its the kind of question wanting opinions, then none of them need to be reported unless they're blatantly trying to provoke someone's anger
A few days ago, someone asked "who told on Nixon about the audio tapes" or it was something close to that. I wrote the right answer which took a lot of digging around so I was sure my answer was right, then a few people said "Nixon" as their answer, one said "John DeN" and then there was about 6-8 people who wrote "Forrest Gump". I didn't know if I should flag those so ai didn't but this is an example of why I think this is a good question. If left up, it will make Ask look like a site for dumb people, or a site that doesn't take things seriously, or is this why we have the "fun" button maybe? I just checked that question and people did flag the Forrest Gump answers so they are gone. I think Josh Bagels answer is the best advice on this question. And I'm glad it was asked because I was getting ready to ask it. It is a good question.