"and try befriending some people with very much opposite viewpoints to your own." Thank you for your judgements on my friendship circles; those I have relations

"and try befriending some people with very much opposite viewpoints to your own." Thank you for your judgements on my friendship circles; those I have relationships with are of very diverse opinions on gender/sexual/racial/wider politicial issues. His reaction may have been juvenile and extreme, but I certainly don't think it was sexist. What makes you say that?