I hc that WPNZ hates being so openly vulnerable because of the way he's seen, raised and grown. Whenever he wants to feel small or soft its in private either alone or with Mr. Puzzles, refusing anyone outside see the hidden yearning for being loved. He'd probably be outright defensive and deny he's capable of such things in a joking snarky manner to hide that void in his chest that is only recently being filled by Puzzles. Even then, Puzzles is the only one who can really reach in there and soothe him in the ways he's been secretly wanting for so long.
You're right. It's why he's all the more lucky to have his boxhead around.









