Depending on how a bad idea is presented, I either downvote (if it's presented without any backup whatsoever, like "Mac users suck") or I ignore. If it's making

Depending on how a bad idea is presented, I either downvote (if it's presented without any backup whatsoever, like "Mac users suck") or I ignore. If it's making a case with faulty information, I try to at least correct the information in the post. But I try only to focus on the really relevant threads of conversation, the ones that I have a chance of learning from.