For instance, "Are you a heretic?" is not making it personal. But "You are a heretic." is making it personal.
Also, "What you have expressed contains fuzzy logic." is not "making it personal" because it expresses the poster's mind instead of reading the other guy's mind.
It is equivalent to saying "I think your statement contains fuzzy logic."
Well, I'll have to take your word for it on that one LOL.