[livueta]

IME removing yourself from the original emotional context of your post works wonders. Write the whole thing, sure, but then go do a context switch - go for a walk, read a different article, make some food, whatever - then once that emotional immediacy fades (which can definitely take different amounts of distracting depending on how pissed you are), read the comment out loud to yourself. Probably 90% of the time I've written something shouty I'll just end up closing the tab.

YMMV, of course, though I found the first couple of experiences of feeling like "wow, what kind of ape would draft a comment like that?" when I go for the reread were enough to emotionally incentivize me to trade time for not feeling like a big rube down the line.