I think things that attract minges to a server is a server that has a lot of childish aspects, or addons.
One that doesn't have proper moderation.
Most minges are younger, some don't even know they are doing things that annoy people. If you don't have a ton of like-- pokemon/mario/nyan cat/whatever else kids addons there are, you will have far less minges sticking around or coming back.
I am also pretty perma-ban happy. I don't kick or ban for a few days, I go straight for the perma ban. In my experience, a minge is a minge, they come back and do the same old thing. Get rid of them for good and don't look back.