Ok so... Sure, this guy is not a good person, clearly. He abandoned the MC in the woods and such, so he certainly is a bad guy. And he beats up slaves for fun, that's not good, indeed.
But... After he explained how he abandoned his hero training cause he didn't like to put in effort, specifically after that, the MC was like "THIS GUY IS TRASH". And at the end he was talking about turning the guy in to the authorities for abandoning his hero training.
But, but, but... Isn't that EXACTLY what the MC has been doing? Yeah, he was left in the woods, so it's understandable he didn't show up for hero training immediately, so he can't be held accountable for that, but that doesn't mean he'd be off the hook forever, right? But he just set up shop in the woods and stayed there, so shouldn't the MC be a fugitive for the same reason?
Now I ain't saying the MC has a moral responsibility to become a hero just cause that rando king said so, but that same logic applies to this other douchebag as well. So he isn't really bad at all for running away from the hero training and living the way he wants to, so the MC has no cause for calling him trash for that.
He's still an asshole for abandoning the MC and beating up slaves and being rude, etc., but that is that and this is this.