Beeing quite a peacefull person myself and prefering psychical violence over physical I doubt I'd been able to controll my hands if someone anywhere would have spoken to a GF of mine like those *looks for words* entities, barely beeing worth the word "human", that eldargal apparent had to deal with.
You can only pray that some people do not come to replicate and return their poisonous nature into the public genepool.
I personally seam to have been gifted with a comparably well mannered local GW store. The worst we have to deal in this regards are people who look slightly shabby (but even them do shower!). Apparently all parties together do something well as we even managed to teach one or two of those "annoying kids" good manners. Dont ask me how but the results stand.
People who act like jerks are usually "introduced" into propper manners by the best four players of the store on the battlefield (and usually spit out in little pieces ). Those who can be saved are then absorbed into the playerbase with little left of their oversiced ego. Those which only game for ego do swiftly recognize that its the wrong place for them and leave for no return.
The worst we'd had happen once was a drunk homeless who wandered into the store and smelled like a whole graveyard full of freshle reanimated undead. He was dealth with by an employe who engaged him with room-refreshment spray (so we could breath again).