[As a child, likely not. He loved when people followed his orders and liked what he liked and generally validated how great he was. Fighting him wouldn't be doing that. And there are positive challenges, so he'd be happy winning over and over so long as his opponents gave him their all. Yeah, bitty Katsuki would be just fine if he and little Izuku agreed.
So long as Izuku wasn't some sycophant...]
Are you trying to get me to punch you?
[Stop couching this in words and just say what you want!]
no subject
So long as Izuku wasn't some sycophant...]
Are you trying to get me to punch you?
[Stop couching this in words and just say what you want!]