JD,
You are speaking for yourself. I understand. You aren't speaking for Libertarians as a group. I understand. Otherwise I don't understand what you mean about forcing people into groups. The laws supporting gay marriage aren't forcing anything on anyone. Those who think they are simply don't want others to have legal rights that they have enjoyed forever.
Laws requiring for profit commercial businesses to serve everyone regardless of race, religion, gender or sexual orientation aren't force. They simply allow access that they themselves have enjoyed forever. The only 'force' is coming from the X-tians, the Libertarians and the Far R, which want to force their own views down everyone's throat. They've lost a lot of court cases recently and they are striking back in mean spirited ways with needless laws that allow X-tians and other haters to continue discriminating and validate their hate.
Within a generation or so this will be a moot point. Gay marriage and equal access will be the norm, and people in the future will look back at the haters in 2015 and compare them to the KKK and other 20th Century hate mongers. And that's not an opinion.