The situation as perceived by society in this anime is portrayed as "no big deal". Ofc, it's a big deal for Rudy. But:
- teachers wouldn't help him
- classmaters don't care
- parents are "get over it"
- parents talk to school board to do ... what? The situation is as clear as it gets
- why was there no mention of any police involvement?
- it all sounded like the bullies just continue going to school
- the end
That's all "no big deal" level for my impression.
Bullying is a big problem in Japan irl, yes. But maybe popular anime shouldn't portray the reaction to extreme bullying like this, because it reinforces the "not giving a shit" reaction in the people watching this. If this was an anime focusing on bullying as the main theme of the show, then you could this non-reaction as a criticism against the bullying culture in Japan. But it's a fuking isekai anime where we only get a glimpse of Rudy's past every 5-6 episodes or so. Nobody sees these scenes and goes "brrrr bullying bad". It's too little to actually raise awareness.
I'm sorry if my opinion is once again the odd one out, but as someone who went throught not as extreme, but years-long bullying himself, it just makes me angry. I wish there was an anime that really took revenge on such bullies in a non-subtle manner. The "bang!"-scene from Inuyashiki remains the most satisfying scene of such nature.