I live in the most socially liberal province having the highest support for gay marriage on the continent and it's still not unheard of to hear stories about homophobic bullying and homophobia, most especially out in the rural regions and small towns. For example, 2/3 of the Quebeckers said in a poll that they would be uncomfortable seeing gays kissing or sending their kids to class having a gay teacher.
I've never experienced it though, despite living here for five years now.
It's the same thing in France as well as other Western countries. The parents may mind their own business about the others' sexuality, but when it comes to their kids, it's a whole another story ("not my kids mentality").