Maybe she was referring to a nice and soft foot? It could be taken as a compliment or as a sign of the child just not being able to communicate properly

You've got sole!

She has no sole for that rude comment!

at least she didn't say you smelled like one...

Some guys really get all hot and bothered over feet... if that helps?

You need to put your foot down on that one.

your nick complements your FML perfectly.

Is that you Sarah Jessica Parker?

But do you smell like a foot too?

Reminds me of a Full House episode where Joey was saying how he thought when he was called a "towhead," when he was younger, he didn't realize it was in reference to his blonde hair. It's possible she heard that term used, and misunderstood it.