I'm definitely not a protected class (I'm a tall white dude), and I am not being 100% fair; they weren't screaming at me or anything, just an elevated voice and very angry words. I don't believe they said any curse words, and even if they did I was somewhat sympathetic to why they would be upset with me (even though I do stand by the content of what I said).

It was probably still unprofessional, but probably not as bad as I made it sound...my bad!