Earlier quoted context omitted.
That's like complaining that you will get arrested for having sex in the middle of the street, but sex in a film is somehow fine(surely it's because movie producers have money and are in cahoots with the government, and not for any other, more logical reason, like the fact that art forms, no matter how poor in taste, are protected by society).
In what legal sense is the YouTuber with the pug less protected by the "art form" argument than the movie production? Did the latter get a permit for Nazi jokes? (Sincere question, maybe they did: UK speech norms and laws are incredibly alien to me)
The rules are different for regular plebs, that's as simple as that. And the lesson is that everyone should know their place.