So yes, this episode was pretty much about forcing Santana to hurry up and make peace with her sexuality before the attack ad outing her aired. I'm pretty sure that in the real world this wouldn't fly, but in the Glee universe it somehow made sense.
Principal Figgins was prepared to suspend Santana for slapping Finn but that was neatly thwarted by the quarterback himself who lied and said it was actually a stage slap. No harm, no foul, no suspension for Santana, even though she continued to belittle Finn, calling him names like the Hamburglar and Fetus Face. Finn had master plan for the Troubletones to join New Directions for that week's lesson and he needed Santana there to do it.
See, Finn was firmly in the Hero Finn mode this episode, with a campaign to help Santana feel the love and support of the glee club members so she would feel comfortable coming out. No, he never apologizes for getting the ball rolling on the whole outing thing by talking to her in the hallway. But he did decide to stop bumping up against Santana's vicious defense mechanism: "I think you're awesome. And when you hide who you are, I think you hide some of that awesomeness with it." Turns out he was scared into action, citing the recent real-life suicide of a teen who'd made an "It's Get Better" video. Finn was afraid that Santana would move from lashing out at others to hurting herself and maybe even dying. He earnestly let her know that he still felt very connected to her because of the fact that she was his first sexual partner and he needed to do everything he could to help her through this. Yes, more about him than Santana, but what can you do? He's a teenager.
You could see the cracks starting to form in the bitchy-Santana facade at that time. But the walls really came tumbling down when Finn sang "Girls Just Wanna Have Fun" to her. She even rewarded him with a genuine thanks and hug. She'd go on to tell her parents, who took the news well, and deal with the lascivious looks and come-ons from boys in the hallway. That was the perfect setup for the rest of the girls to back her up against a tool who wanted to make her a challenge. So they all sang "I Kissed a Girl" and pretended to be into each other.
When it came time to tell her grandmother that she liked girls the way she was supposed to like boys, she got rejection. The same grandmother who had warmly sat Sanana down in her kitchen and tried to get the girl to eat more cast the teen out and said she wanted nothing more to do with her. It was a good dose of reality to have at least one person in her family not take the news well because that is the sad fact for a lot of people coming out. And should anyone be surprised? Wasn't this the same grandmother Santana said raised her on insults? Why would she expect comfort and acceptance in her arms?
NEXT: Coach Beiste takes a stand against Sue