I saw the episode recently and thought about what Sam said about not being able to not insult Freddie. Wonder that instead of Sam just being incapable of not insulting Freddie constantly, maybe she is afraid that being stuck into saying nothing but nice things, something hinting at her true feelings might accidentally slip.
She came close when she refused Freddie's invitation to kiss him and adds, "thank you for your kind offer."
That was my take on the ep, what do you think?