Straights are already the dominant group and the majority. They don’t need to be “included.” They are the assumed default. No one is attacking straightness!
If you’re cis and straight, don’t try to make this about you. It’s not. You wanna feel special? Go paint or something. You want to help us? Great. Help (listen before you “help,” please).
But don’t think for one minute you need to be included.
If you’re ever tempted to say something like “I’d like to add straights too. Everyone needs support.” Stop.