Oh, I fight the good fight. I'm very set in my ways, opinionated, and I ain't budging once I dig in my trench. Anything else is losing face. My knee jerk reflex is mighty! I love a good fight, it gets my blood flowing. But it consumes me completely. I'm only interested in being right and seeing others tell me how right I am.
But, I too have been taking some steps.
First and foremost: Admit the above to myself. If I know how I behave, I can react to it. I know I've got a thin skin, a huge ego, a delicate pride, and poor impulse control. So I got to prevent the temptation, rather than depend on my weak judgment.
So first, I avoid threads where I have no business going. I'm not stepping into a 3e thread, or a Pathfinder thread, because I have no interest in those, and those involved are better off without me. I want them to enjoy themselves in their own corner.
Then is something I've been trying: once I've dug my trench, and defended my point, let it go. Once you're in an argument where neither side is going to budge, and you're just re-hashing your original point, there's no reason to continue. Otherwise, it's an exercise in dragging it out.
Finally, I keep my ignore list firmly in place. Out of sight, out of mind.