One of the few times it's 100% perfect to have an older white dude with a beard mansplain to a young girl.

Except that is not mansplaining -- mansplaining is a man, assuming he knows everything better than women simply by virtue of being a man, trying to explain something he doesn’t know that much about to a woman who is expert in that area.  This is a man sharing his knowledge with a woman who has clearly demonstrated she has no idea what she is talking about.  That’s just called explaining.