Since when can't you state your opinion..

[aDisabledDeer]

Infernaw is on point here.

It's stupid to get all pissy over being called a "bad mod". I lost count of the times I was told I was shit, a *** and a whole plethora of insults (some really quite amusing actually), I didn't really do anything to them. A few I would, but usually just a tag on the ban reason but primarily because they made other infractions. 

Frankly, I couldn't give a fuck what they thought! I just laughed and moved on, zero point getting knickers in a twist over it. Actually immature to be honest...

A good admin or mod will realise that this is just a Garry's Mod server, and that being insulted doesn't really mean anything.

Just laugh at it and move on, they'll never see the person in real life so they should have no difficulty in just muting them or ignoring them.