Attack him?

You misunderstand here. An explanation of simple psychology is in order.

You see, he attacked something that collectively we like. We like it so much we have a chatting area devoted to it, where we share how cool the thing is. This cretin has decided to devalue this thing that we like. In turn, this devalues us.

It is indirectly a personal attack, and consequently, when bitten, creatures bite back.

Or to put it even more simply... If you throw a punch, don't whine when you get punched back.