It is an opinion, what else could it be? You think it is wrong, but I also think many other prevalent mainstream opinions are wrong and injurious to my rights - such as banning me under the threat of imprisonment (or being shot by the warrior police, if I'm unlucky) to own certain chemicals, or certain tools of self-defense, or even certain information, or engage in certain voluntary transactions without prior state approval. You may say it's for my own and for society's benefit to restrict my rights, and everybody comes out ahead with it. But that's exactly what the other guys say too - everybody would be ahead and society would benefit greatly if only gay marriage were not allowed. You say holding such views is despicable and non-acceptable to the point that if you use browser which is made by a company whose executive holds such views you are tainted by it. Then I ask why you're not tainted by having people supporting even harsher infringements of liberties? Should we boycott everything that has relationship to people ever supporting gun control, war on drugs, rent control, zero tolerance policies, blasphemy bans, speech codes, etc.? Should we ban people known to have socialist sympathies (and this comes as close to actual slavery as it can get - socialist governments actually implemented forced labor many times and routinely strip people of their rights) from participating in our communities, for example? How far should we go with this?