Does the same advice apply to Evangelical Christians concerning Roe v. Wade or Obergefell v. Hodges? Or Republicans and the Affordable Care Act? Or creationists and Kitzmiller v. Dover?
Or, you know, they could behave like individuals in every other representative democracy and petition their representatives to have the laws changed. Or push cases forward into courts of law.
This 'love it or leave it' mentality is such spurious rubbish. You can love your country, and still want it to be different from how it is. In fact, if you love your country you should want to stay and change it for the better. Even if you disagree with other people on what that better actually looks like. Especially if you disagree.
It's such a reflexive, zero thought turn of phrase. 'Hur, hur, if you don't like it, you're free get out'.
Guess what? They're also free to change it. And if you don't like it, you are free to move.