That Mayson can take a flying leap... oops. Sorry, she needed to get a hit long ago. I'm glad Lois was able to get her feelings out about Mayson and how Clark can always tell when Lois has something on her mind.
Clark is very observant. He spent a lot of time becoming fluent in Lois Lane.
Mayson does have a reason to be upset -- (ie: she thinks Clark just walked off and left her with no explanation)--but yeah, she's being a bit of an annoying twat right now. At least that's how she's supposed to come across.
Lois needed to get her feelings about Mayson off her chest and Clark as always finds a way to make her insecurities disappear.