Some people cross the line in their evangelization, others do not. It’s one thing to spread the Word, to answer questions, to show someone what the Church teaches, and quite another to try and make Catholic law the only law. We don’t do this. That’s an individual Catholic’s response to the secular world.
Not supporting gay marriage is not the same thing as telling non-Cahtolics that gay people can’t get married. You can teach the rules and teachings of the Church without stomping on the rights of others. God gave everyone free will, not just the free will to obey Catholic laws.
Yeah, that would make me very uneasy too. Catholics aren’t obligated to turn the country’s laws into the Church’s laws. Jesus said that when you’re evangelizing, if the person to whom you are speaking rejects your teaching, to “shake the dust of that house/town” from your feet and go to the next one. He also said to give to Caesar (the secular law) what is Caesar’s and to give to God what is God’s. That doesn’t mean that you shouldn’t fight to get laws made or changed to reflect what you believe to be true. But it also doesn’t mean that you have to go against your conscience and lobby and fight for laws that you consider unjust despite them being laws of the Church. After all, we follow the Church rules voluntarily, even if we don’t understand them or agree with them.