I thought you were American
A classic insult that makes people roll their eyes and laugh. It's the go-to line when someone says they're not straight and you're too dumb to think of anything else.
At school, my friend said she's a lesbian. I said, 'I thought you were American.' The whole class laughed at me.
My teacher told me she's bisexual. I said, 'I thought you were American.' She gave me a D.
I asked my mom if she likes girls. She said, 'I thought you were American.' I got grounded for a week.