Just because a tomboy is having fun playing video games with guys does not mean she's straight or hates idol culture. It just means she's honest and lively. She's not going for the fake gachikoi baiting route because she's young and riaju and find doing that uncomfortable. I know you might have low self-esteem and think she's mocking you, but she's not. Just stop being blinded by hate and see her for what she really is.
https://www.youtube.com/watch?v=AZNd_iJnC90