e.g Wilder bumps into Lomachenko, he knows Lomachenko is p4p better and immensely skilled, but he also knows he'd kick his ass because he's so much bigger. Must be hard to respect them as much.
I have no doubt they all think "pfp is a bs concept made to make little people feel better about themselves". One time Wlad was with some lower weight guy, forget who, and it was practically writ large on his face.