Aiden has been in one episode so far. Think about Michaelas situation. This is the man she’s engaged to, she has her whole future planned out, then this comes up out of nowhere. The guy she’s trying to beat in class - is now (in her mind) the guy she needs to beat in her private life as well. Is it really that weird that she’s asking her fiancé if he’s gay? She’s reacting in the moment, and with Connor’s teasing it’s kind of a normal response. She is just too afraid to loose him.
We might discover in upcoming episodes that Aiden is indeed bisexual. Just wait - have hope in the writers. We still don’t know the whole story about what happened, we know Connor loves to annoy Michaela (“also i barely remember what his penis looks like, wait no i still do” then he sits back waiting for a reaction from her). Aiden said “it was years ago, hardly anything happened”.
I understand the frustration over the lack of bisexuals on television. But please don’t blame it on the characters and their reactions.