How about "Why don't you liberty-hating neo-communists leave?"
or
"This country was built on a love of liberty and the guts to stand up to overreaching, self-righteous tyrants. I'm following that tradition".
Then again, Ayn Rand put it well (through the mouth of Leo in We The Living) "You can muster the most heroic in you to fight lions. But to whip your soul to a sacred white head to fight lice..."
That is to say, there are plenty of great snide things to say against the enemies of liberty, but your words will usually fall on deaf ears or cause unnecessary and unworthy strife.