My brother in law is a guy who knows pretty much everything about everything. Pretty much any interesting topic you bring up, he’ll have a deeper, more interesting conversation ready about that topic. This might sound annoying, but he’s got a way of making it seem like you’re discussing something you both already understand. Like, he isn’t explaining things unless you ask, he’ll say things like, “I’m sure you’ve already seen/heard of this”, “Maybe you were the one who told me this, but…”, (even when I’m pretty sure he knows I wasn’t) etc. By giving you the credit for the information, it removes the feeling of him trying to be superior or condescending. This might still be mansplaining, I don’t know. I’m a man, so maybe I have more of an ignorance for being mansplained to since I don’t have to constantly put up with it, but this feels a lot more like a man explaining rather than mansplaining