I fall somewhere in the "What counts as a flame?" and "I don't really care."
Always enjoyed a good debate, sometimes the best way to learn something or look at something is someone else pointing out an opinion you never would have thought of on your own. However, the key to any debate, or conversation for that matter, is both parties having and willing to use the ability to admit they're wrong about a previously-stated opinion. If neither side can admit the other side has a point, than it's just a back and forth until one bludgeons the other into their way of thinking, or they get tired and leave.
So, someone responding to what I say with a different opinion, even one a polar opposite of what I said, if done so with that same respect and desire to flesh an idea out that I share. I don't see that as flaming, just good conversation. However, that's the rub, some people can be respectful and calm in contradicting you, but simply re-state the same opinion over and over without re-examining their own stance. I find that more annoying than a hot-headed response. Though, by annoyed, I mean along the lines of "Oh, this conversation is a lost cause, moving on."
Than there are the trolls or just people begging you to take the bait by taking anything you say to the highest possible extreme. Those fall in the "I honestly don't care" part. I try to split my day into different parts, and each part has a certain amount of effort or care I put into it. First part covers family, wife, son, siblings, those I care a great deal about. Next part is work, finances, quality of life, still a good amount of caring, than you have sleeping, eating, bodily functions and hygiene for the next part, and those are important things to care about.
The last part, that tiny, last, little part of my day left over, that part is for "Things to do that won't cause any problems, may make me laugh or smile a bit, and be forgotten by morning." and the entire goal of this part is to take the smallest amount of effort and require no caring. So, whether or not someone flames my post, it will still belong to the same level of caring that I dedicate to watching TV while half-asleep.
I realize that the length of my post may seem contradictory to my points, but that's because I'm unable to make concise points.