I think something that the writers of Bojack wanted to emphasize is that his behaviour was especially egregious because he had so much power. In the final season especially, they show us how his actions have major impacts on the lives of others, especially women/girls like his co-star from Philbert, Sarah-Lynn, and Penny. It’s hard to compare because Eleanor didn’t have as much power as a non-rich, non-famous woman, but we can compare how they used their power as adults over children: I think it’s significant that while Bojack used Sarah-Lynn and had a big part in her death, one of Eleanor’s few truly good moments of her life pre-death was treating her (niece?) kindly by taking her to the mall and getting churros.

And the fact is Bojack did have more power and abused it/failed to recognize it, and he’s accountable for that. So those are some of the reasons I think Bojack is “worse” than Eleanor.