Ah yes, so bad that the bad character marries someone he groomed, someone he raped, and someone who is described to look like a child.

The show has been written to glorify Rudeus’ negative behaviour. In the beginning he’s already a repulsive person, but there was potential for a growth arc. And yet, he doesn’t. Sure, the show addresses some topics like ED for him to deal with and learn from, but it feels quite limp-wristed - he grows and learns from things that negatively affect himself, not from things that negatively affect others. For example, when finally Rudeus is poised to understand the implications of his actions and the impact he has on other people, he’s suddenly just groping the redheaded kid. Rudeus dealing with depression could have been poignant, yet again - panties.

Loli in and of itself is kinda grey area, and as such is tolerable in media. But the combination of Loli with other factors pushes it into the negative. Add on Rudeus being depicted as a good guy during all of this, and it’s clear that it’s a power fantasy isekai where the repulsive MC might struggle, but gets a happy ending nevertheless. Rudeus might be depicted as feeling bad/apologetic for being creepy, yet he doesn’t change. What do you mean he gets to walk free by perving over a figurine with the guard. Or that Eris’ father wanted to tie her up with Rudy’s bed to gain political standing.

So in short, it was depicted bad in the same way that someone play fighting might go “staahp, noooo”.