I actually outlined why I thought they were wrong, and shut your mouth is clearly attached to not making subjective statements about other people's belongings (which, I absolutely stand by as inappropriate) -- so yes, an angry but on-point comment is better than just throwing out "lolsux" uselessly, or in the case above, based on wrong information.
"Shut your mouth" is indefensible on HN, and pointing at the other person is a low-quality move. Since you don't want to use this site as intended or take responsibility for misbehavior, I've banned the account.
