This is turnabout, or something. Probably.

But really more importantly it keeps Peter from thinking too much on this. It'll be harder to ask and check again in the future, but at least he knows what they're going off of.

"Ah, cool it, Chamaco. Everybody's different! It's not actually a big deal. I'm taller than just about everybody except Imelda's brothers. Those two are monsters." He passes the measuring string back.