I'm too busy not wanting to have a body or expression to think of which gender this body should express itself as. To be fair, I'm not sure if this counts as cis, but it's similarly easy.
This video by Vihart encapsulates my feelings on gender pretty well.
But on the "straight" part, attraction is a very complicated thing. Lots of people will never or hardly ever feel any sexual attraction to people of a gender for a myriad of reasons.
And I suppose that, for a lot of cis people here, they actually like the role at least a little bit. Considering how toxic the enforcement of those roles are, I think we should also cherish our cis comrades who feel the most comfortable in them while being receptive of trans people and being good people in general.
Nothing wrong with being cis, just with being an asshole about it.
It also strangely made me glad I don't do "interpreting" or subtlety. People are told upfront what I want to say, no "did they notice it was a date invitation" horror.