I know that you aren't one of those who got into the character of Damian via Supersons and i also don't believe that you or anyone else here read the title because it was the only place they could stomach Damian.
I would also argue that while those examples might be viewed as jokes that's subjective the objective truth is that they DID make him look bad at the expense of Jon.
Damian's only pot shots at Jon were around him being a farmboy or Damian bragging which also made Damian childish and pompous.
We have seen Damian relate to kids around his age in a casual situation. We saw this with Colin, Suren and Maya. So Tomasi already had something to work off of and we the readers already had an example of how he should be. Even compared to Maps.
Compare all those established examples of Damian to Jon and tell me you can't see what's wrong.
Not even gonna touch on all the comedic violence in Supersons