Liberals and progressives have done a fine job hiding their involvement in past injustices but let us not for a second pretend they weren't real and serious or that conservatives were not fighting to support them and, in many cases, still are fighting.
In addition to displays of venomous hatred toward gays by reactionaries, the mainstream conservative stance towards gay marriage was/is clearly that it is a lethal threat toward a fundamental pillar of civilization. Those are fighting words. Hatred may not be too strong a descriptor. In ten years conservatives will pretend they weren't anti-gay like a Democrat pretending he was never in the KKK but that will change nothing.