In the future everyone is going to be bi-sexual and it is going to be a really fun time to live in..
Well, anyway. Due to my love of the free exchange of ideas I wouldn't particularly mind your friends opinion. Why? Simply because everyone deserves their opinion and bankrupt opinions are always swept under the rug eventually. Which is why the free exchange of ideas works so god damn well! Some one said that the best cure for social troubles is time, something to that effect. Well they are right. Example. Nazism, bankrupt; racism/supremacy, bankrupt; Separate but equal, (bankrupt 50 years ago according to the American supreme court but also apparently still an option for homosexuals...) on the verge of bankruptcy, heh.
So my answer to you is. Don't simply berate your friend because of his ideas. Instead, ******* destroy his ideas in a logical debate or discussion and chop them up into little bitty pieces. Hehehe, burn faulty ideas to the ground with rhetoric! destroy, destroy, destroy. Kolkolkolkolkolkolkol!