The "heightism" assholes are getting more and more annoying.
The obsession on "pussy" is stupid, and I'm not sure it's not a troll. That being said...
One of the things I think is worth criticising in the Social Justice movement is that they focus a lot more on privilege that works in discrete categories (man vs woman, white vs non-white, straight vs queer, cis vs trans) than privilege that works on continuous traits (wealth, attractiveness, and yes, height). The obvious reason is that discrete categories are simpler and easier to build a narrative around, but I'm not sure that's all that's going on. For one, weight is the obvious exception to the rule, and I could speculate about that but I don't have a good model that accounts for it.
Still, it's as far as I know true that there are social advantages to being tall (
for example). I don't think that means we need to start a social activist cause around it, mind you.