That is a childish sentiment; those people will still exist in the world and still vote, even if you pretend they don't.

Only sustained, long-term communication and engagement creates lasting cultural change. That means talking to the people you know who disagree with you. In fact if you know them, you're the best person to change their mind.

If you don't believe this can work, compare the political status of gay marriage in 2004 vs 2014.