I find it rather repulsive, that people would label “being against gay marriage” as “only holding an opinion”. It makes it seem so harmless. It is depriving people of the same rights that heterosexuals have. And that is why it might matter to people. It’s not just “any” opinion, like a view on how the economy should be regulated, where one could definitely argue about. But a view, which would deprive people of the same rights that others have, is not a valid opinion to have. There is no way that it can be respected. It’s the paradox of tolerance

In a comment further down you write the following: (Edit: the comment has since been removed by a mod)

You have the right to have a liberal opinion so why not let people have their own? It's like discrimination of black people at this point.

Which is quite ironic. You try to defend holding an opinion, which would discriminate against a certain group by not giving them the same rights. You argue that it’s discrimination to not respect their discrimination. In essence you ask the tolerant to respect the views of intolerant.