@Supremegod17
How is he unlikable? Did you forget they were enemies up until a few minutes ago?
He's unlikeable because he does not display any positive qualities in those chapters. Basically, his behavior indicates that everybody is a pawn for him. Possibly a disposable one. Spider and his teammates too.
He's pretty much messing with the spider for the heck of it although he could've just wrapped it all up quickly. Doesn't need to do it.
He doesn't even need that magical gem he asked for. Doesn't give a damn what its removal could do to the original owner, and then goes "Huh. So she reverted back and now her skin is peeling off, and she's gonna die. Cool.". And also takes advantage of the spider being dumb by robbing her blind.
He gives off the exact same vibe as some sort of martial from a xianxia, now you mention it. Protagonist from Master of GU, for example would be the same as him.
Classic portrayal of hero would be mercy/sympathy towards enemy. While I wouldn't want to have a full shounen saint protagonist, the MC has just has ZERO pity towards the enemy that spent most of the time in last two chapters being utterly pathetic. And that simply makes the MC unpleasant as he lacks human qualities. Like the other guy said - "wisdom at expense of humanity".