I dunno, I see your point but does the guy on the left really have a dented head? I thought those were forehead lines from emotional agitation. Also, where is the drool? I only see tears. I don't really see the inherent ableism, as much as I see a negative representation things like lack of emotional regulation, "neckbeardyness," etc. I agree moreso on the whiteness and general tidyness of the chad, and the association of beauty with good and ugliness with bad -- I kinda buy your argument there. It is pretty shit that we do that, but I don't necessarily think it's wrong for the OP to use this meme template. Ignorant? Maybe.
I feel like you could use similar strategies to decry any meme. For example, the glorification of violence through imagery and use of the word "weapon" in your own meme. Obviously, I'm not going to seriously suggest you're perpetuating the glorification of violence through your meme, but I kinda think its the same with OPs meme.
Edit: to be clear, all my thoughts on this are entirely from the last 20 min. I assumed you've thought more about this subject than me, so I consider myself pretty swayable. But idk, my initial reaction is that we're looking too far into a meme.