thats not true at all. its considered gay because its not fun to play against. the reason why mge rules exist, i.e: letting the opponent jump, not counter jumping, not shotgun denying etc is so that u can get the most practice out of playing whilst having fun.
its an attempt to simulate real tf2 scenarios. ppl dont get mad at ppl who play gay cause they lost elo they get mad because they lost in a way that doesn't really prove anything cause their opponent won by doing shit that u couldnt do in a proper game which is why u hear all those invite players crying on their streams why they prefer dm over mge and they dont set foot in an mge server cause they would lose to iron/div 6 ppl who will then get some kind of false ego that they are good