Senior admin does reserve the right to change the map. I believe rapidly, in this case, can be defined as over and over. I rarely change the map in any server without first getting a concensus, however, not all admins do.

Is it a dick move to not consider others in the server? Maybe. Will the rule ever be changed? Doubtful.

It is up to the admin. if theyre repeatedly changing it to maps that are glitchy or are unplayable for some reason, thats one thing..but if theyre doing it to their preference and a few dont like it..not necessarily illegal.