It's heavy because there are important emotions involved. Surely Tony's known enough speedsters over the years to know how shit they are at emotional matters.

"Not apologizing. I swear. I just... I want to get him something nice? That's how people show affection, right? And borrowing clothes. But that's more the affection the person being borrowed from is showing. And he's bigger than me. So it doesn't go well in the other direction. Normally I'd find a store and buy something. And I guess I could use the replicator for that. But I do it with window shopping. Like for his birthday."

So he's lost.