I'm going to tell my friend not to assume everyone is straight
Do they assume that about you?
Yes, she doesn't believe that I'm gay.
I'm sorry that happened to you. It's considerate to not assume others sexuality. You don't want to offend anyone so you shouldn't say anything about it.
You are right.
I'm glad to see my side of things. I think showing them some educational videos online would be beneficial for them on this topic.