Well he stated he felt the thread was only spam and should be locked, which I count as being thinly-veiled flaming since if it really was spam, you'd just report it and wait for a mod's opinion. Telling it to the person's face without knowing their intention has the potential for harm.
I feel the best way to deal with such threads is to be chipper and add constructive criticism, since if the thread is legitimate the OP will have a good environment to learn in, and if they're a troll they wont get the response they wanted and just leave.