The joke was that
>HE'S KIND!
is a male-written, male-oriented isekai meme where onaholes characterize MC likeability with kindness being at the forefront.

The irony is that MC is a chad thundercock with reality-bending cheats, just humblebragging for a bit and treating people like people. Apparently this is enough to get onaholes panties wet which is the crux of the joke.

I hope you get it now so I don't have to explain this again.