There have been far too many attacks on FR lately and I'm guilty of it as well.
One problem I have found is that criticism tends to be taken more personally than it is meant. The words "you" and "your" are the triggers for this, they cause a defensive reaction in the recipient. I have taken to intentionally substituting the third-person pronoun "one" as an inocculation against being seen to criticize a person when I mean to criticize an idea. I've found it works well.