some straight guy i was friends with was obsessed with me. he only cared if i liked men and had a bf for some reason, and would ignore that i liked women. he would act like i was straight and that if i dated women, that just meant i was single and obviously interested in him.
100%? No. When you put people in situations where they’re entirely segregated by the sex they were assigned at birth, people tend to take same-sex partners even though they would not consider themselves to be gay or bisexual. On the other hand, my guess is that most people probably round up; e.g., if it’s very, very rare for them to be interested in someone that’s the same gender, they probably think of themselves as being straight.