I always use their OWN rules against THEM. Tolerance for right wing special interest groups in the name of "fairness" and "equal opportunity.". Birth and ultrasound organizations next to an abortion clinic to offer REAL "choice" etc.
It's easy to use their own rules against them. How can they argue against themselves?
c.a.p. pretty much has nailed the root principle here. the main problem is leftists are projectionists - they are always trying to point the finger at you, keep the spotlight on you, etc., and that is their Achilles heel.
Point the finger at them and their whole house of cards falls down. The best way to do this is to hold them to their own rules and point out their hypocrisy. You use their own momentum against themselves.
Judo is the best tactic against Alinsky.