What communities do you even frequent..? May I suggest that you don't?
As a Dutch guy in China, my height is brought up a lot, and I know Westerners who moved to Asia because they fetishize the feeling of being taller. I just make jokes that I'm taller in the morning than the evening, or joke that I used to be taller when I was still wearing high heels (for the times that I was able to stand up right and not with my ass on the ground).
Your title might as well say: What's up with terminally online people and hyper-focusing on minute issues to distract themselves from their bad personalities or lousy socio-economic backgrounds?
One fun thing I've noticed being a tall Chinese guy in Asia is that often wirey white dudes will give me the death glare on the street for absolutely no reason. Like I'm stealing their schtick just by existing.
I'm reminded of all the "lol Yao Ming was made by Chinese scientists cuz Asians are supposed to be short" jokes I saw back in the day. Like... there's a billion Chinese people. You hit the button on the genetic slot machine a billion times and you are going to find an exception to every rule. Humans are cool and awesome like that.