I guess this has to do with people trying for (in any sense) "higher standards" being perceived as hypocrites when they fail to meet them. Whenever you have a movement that claims to be "trying to make things better", you will be attacked for having any problems even if everyone else also has those problems.

In some sense, I think this idea is even valid. "You're trying to be better so why are you not better at this particular thing?" seems like a reasonable question. It's just sad when this is used as a general argument against trying to improve things.