@FgoSegul Yeah I agree. She has a point, but there was no need to snap over it. I, for one, just smile and nod if people are telling me something I already know (unless I'm pressed for time or something, which wasn't the case here.). And if she was bored, she could have just said so nicely. It's implied that she never had any intention of learning from MC with the way that she never showed interest or asked questions, and only finally spoke when MC got something wrong. Like, that's not the way you go about learning, miss. And if she had interacted with the MC more, then she might have been able to more accurately judge her knowledge, before determining that MC had nothing to teach her. For all glasses knows, she could just be going over the simple stuff, because glasses never showed what she knew already.
Well, this was a long way of saying that I agreed with you, LOL.