Recently, a friend of mine got entangled in a discussion on California Proposition 8 which defined marriage as between a man and woman.
Besides Christians, Muslims and Jews also supported this proposition.
Because my friend expressed his support of Proposition 8 and revealed his views on homosexuality, he was roundly pilloried for it by his pro-homosexual friends, being condemned as being intolerant and even being un-friended on Facebook.
Some of the things I learned is that people will be upset with just having a different opinion than them, so be careful about who and what you reveal to people.
However, being condemned for having a different opinion is unfair. Real discrimination is when someone denies you a seat on a bus, or refuses to give you a job, a place in university, a promotion.
To merely have a different viewpoint and being condemned for it, is the real intolerance.