Heightism is transphobic.
You're picking out the one trait that trans people have and railing against it.
That's transphobia by proxy.
Is it any coincidence that short man hate ramped up recently, in light of widespread transphobia and TERFism in cis women?
TERFs want an excuse to hate and berate trans men because according to their ideology they can't, because "they womemes" or some shit.
What better than to attack men who are shorter than 5'9", so that the trans men who happen to pass can't get away with it.
It just seems awfully convenient.