Oh no, he can't accept shoes from a human! Not that it would really work, since he gets the feeling that swapping out the shoes would be Bad. Besides, would they even fit?

"No, it's fine. You need your shoes, don't you?"

He hardly sees humans going out and about barefooted!

"Anyway, these are bad because they have heels!" 9S whines. As if the kid can't see already, he sticks his leg out so the shoe is more visible. He's hanging onto the lamp post for balance, but he still wobbles a little.