Is NOBODY wrong in the post ? POST : My girlfriend was at her parents place today having dinner. Her sister and the sister's boyfriend were also present. My girlfriend was watching Queer eye on TV with her mom when they sister's boyfriend made a comment about there only being 2 genders (male and female) and that their goal is to procreate. My girlfriend took offense and told him that that isn't true and people can be different. He didn't budge from his position.

She called me afterwards, pretty emotional, to tell me about this event. I fully agreed with her that she was wrong. What annoyed me is that she kept calling him "fucking dumb" which prompted me to say that she may have changed his mind if she empathized with him more. With this I mean that his upbringing may have been very negative towards LGBT and non male/female genders. 

My girlfriend got even more upset saying that she just wanted to vent rather than have another discussion with me. Never was my intention to get her upset, it simply was to provide another point of view. 

I'm genuinely not sure if I'm the asshole here so I'm interested in your opinion.  