While Sugita's shaping up to be a loser of one kind, Takamura's strengthening his already attained loser status. Everything he's said, almost every way he's reacted to Senko--from the start, especially after everything that's happened--can't be explained with simple logic.
On a side note, all these people crying about "age gaps" are absurd. Must be the same people who think you're still not an adult even if you're in your mid-20s, and that's okay to still claim you're "trying to find yourself" in your late 20s, and that old, used, and abused roasties are ideal. Whatever the case, such people have also been spoiled by the long lifespans filled with comfortable living humanity now has the opportunity to enjoy.
It's all even more egregious when you consider the apparent fact that Senko is more mature than Takamura is. The latter's hardly ever stopped behaving like a little boy in a grown man's body.