At the simplest level of ethic, the Lord does not permit a Christian to talk abusively to others. Merriam-Webster defines "revile" as to inflict verbal abuse about another. This includes profanity, name-calling (such as calling someone an "idiot" or worse), dirty innuendos, and other such things.
Reviling is a serious sin in God's eyes. We're not to associate with revilers (1 Cor. 5:11), revilers are on their way to hell (1 Cor. 6:10), and the Lord lumps it in with other reprehensible sins, such as self-love, greed, boastfulness, arrogance, rebellion against parents, ingratitude, and ungodliness (2 Tim. 3:2). 99% of what I read on Twitter, comment threads, and sites like Reddit pertaining to current-event talk, is reviling.
Second, God is politically impartial, which should make all politicians of all parties in every nation tremble. God doesn't take sides. He does not favor Republicans. He does not support the Democrats. Jesus was not a socialist. God is not even an American.
He is His own side.
Third, God has a moral law. God's law hangs over America like a sword dangling on a thread, and only His mercy holds back the blade. If God's law condemns something, like abortion, homosexuality, needless wars, and the abuse of the poor (which it does), then we Christians are obligated to condemn those things also. God's law condemned Herod for taking his sister-in-law as his wife, and John the Baptist was right to call him out on it. (I bet there were people who called John a snowflake.)
Fourth, Christians in every nation need to remember that this world is not our home. We are not living in the Promised Land. We're more like the Jews in exile in Babylon. We ought to seek the peace of the various places where we all live, but we are not of this world.
I believe it is possible for Christians to serve honorably in public office. The Bible does not support the Amish way of withdrawal. Total withdrawal from society would betray our commission to be salt and light. Deborah served as a judge. Daniel worked for a pagan government. Isaiah served as a prophet and as a government official. I'm sure it's hard, but with God's help I believe Christians can serve in public elected office, and we should.
But to imitate swinish behavior disgraces the holy name of Christ. If worldlings are tearing each other up, we should take a step back. Do not join in. We need to maintain a higher standard, even if we are mocked as weaklings. We Christians need to set a godly example to a lost and dying world, including when we engage with the heated social issues of the day.