You could have tried reporting but i have found the GM's can't do much unless you know what server they are from and have chat logs so you probably want to do some prep and research first. I've found a lot of trollish or just plain difficult Tanks come from Sargatanas i don't really know why that is. Is that supposed to be some sort of hardcore server where just being on it people think they are better than they are? It's been like 95% of cases where i had a diva for a Tank they came from that server.