Hate towards speedruns is actually a product of speedrunners hating on everyone who doesn't speed run. Recent example is Brayflox, tanks who were not used to speedrunning or didn't want to would get harassed for not doing large pulls, inexperienced healers would get harassed for not keeping the tank alive during huge pulls, DPS would get harassed for not doing enough damage, etc.

If everyone got along from the start, I'm sure there would be no problems with speedrunning.