[krastanov]

Theirs is not just an opinion when you have a few decades of sociological research to back it up. If you want to see research supporting the claim that you are wrong a good starting point would be Project Implicit's webpage.

Indeed, the person that responded to you could have been less inflammatory, but it is pretty hard to keep it cool when you are surrounded by people that dismiss an entire group of people based on gender, sexual orientation or skin color.