There's been a few cases ages ago when I went and got myself involved in a few petty arguments on the last forum I frequented. Shoulda just gone and ignored them alltogether, since they turned out to be bait set out by trolls. Felt utterly aggravated for trying to reason with someone who was just pushing peoples' buttons for a few sick laughs.'
As of late? Nah, not so much- I generally write what I feel and think at the moment, but I tend to keep my self-censorship on board when visiting the forums. A few late-night posts are something I tend to regret a bit, actually, but thankfully those are rare nowadays as I got to hit the hay early.