Do cis-passing nb people who like the opposite sex perpetuate stereotypes?
I don't believe this to be true but I have known a few queer folk believe that cis-passing nonbinary individuals who are attracted to the opposite sex (sexually and/or romantically) are perpetuating cisheteronormstive stereotypes.
There are also some who seem to believe that relationships between a couple who look vaguely straight is problematic and I think that's ridiculous.
You can't help who you fall in love with and/or want to fuck.
Speaking for myself, I'd say I'm rather fluid when it comes to people I am attracted to but mainly I lean more straight than gay