These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Steven Universe
Double Standard: Perhaps it's too soon to tell, but the pilot seems to imply that females can be stunning in every shape and size, but we can laugh at chubby guys, har har!
To be fair, the only person to actively mock Steven for his weight is Lars. There are very few visual gags based on Steven's weight, the ones that are there making sense in context and not being played up, and none of the girls comment on it.
It's jarring because no visual gags or jokes are made about Amethyst, who is arguably even more heavyset than Steven.