I'm not here to defend Vaush like...at all, but more so I wouldn't go too far in on Panty and Stocking characters.
Despite being drawn up like they're in Dexter's Lab 98% of the time, The main girls still look like the rest of the adults in the show. With Gaterbelt the priest being the only one towering over them. Stocking herself is the more loli-ish of the two sure, but she leans more into Lolita fashion than actual Loli. Which yes, is enough of a difference to lead to getting lost in the weeds.
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Again, not defending Vaush, but Stocking isn't the ammo.
Now all that being said, I doubt Vaush knew any of that and just saw her as...*ahem* a short-stack goblin.