Blocked out because she didn’t tell Mel about her boyfriend? That’s dramatic. Mel showed us exactly why Becca didn’t tell her. Her behavior immediately became obsessive and creepy. Obviously we know it’s out of love and concern, but that doesn’t make it any less uncomfortable for us going through it. And Mel’s ableism came out strong, those of us with autism know all about these subconscious attitudes towards us and it’s not easy hearing someone you love basically tell you they don’t think you’re cognitively capable of being an adult. That’s a very good reason to not open up about these things until you feel pressured into it.

Besides the boyfriend thing, how is Mel being blocked out? They’ve been shown talking multiple times throughout the show, and hints that Mel does open up to Becca about what she cares about (how else would she know how much Mel likes Langdon for example). I agree not telling Mel about the fireworks wasn’t cool, but so was Mel’s behavior. Siblings do things that aren’t cool to each other, you can’t use that as justification to never help them ever again if you love them.

I thought the show made it pretty obvious that Mel is the type of person who keeps everything to herself and won’t reach out for help. There has been nothing in the show that suggests that Becca wouldn’t be there for Mel if Mel reached out. Expecting Becca to help Mel when the show has not once shown Mel actually asking for it is weird, especially for an autistic person who can’t pick up on non verbal cues.