I've seen a bit stealth, but actually, I thought there wasn't so much as at some times. Different threads, maybe.
Anyway. My favourite example of mansplaining was watching a (male) colleague explain to a (female, queer) colleague that it was hard to be a lesbian in our workplace because the men tended to do all the talking. Her face was interesting to see.
My brothers are excellent at it, too. They mean well, but between them, they have mansplained to me such issues as renting a house (he's done it all of once), buying a bra (!), the tampon tax, the role of women in academia, and the female anatomy during labour (according to big brother, baby can't get stuck because 'the body is shaped to prevent that'. Oh, it is, is it?
).
Last Christmas I was having an argument with my little brother about the history of women's work, and he eventually said, seriously 'well, we can't really say for certain, can we? We'd need to ask an academic who works on gender studies'.

Ooh, that was calming. Sorry, didn't really help your thread but it was soothing.