Interesting it doesn't work both ways...
Anyway, If someone tailgates me while I'm by myself, I just start downshifting and dumping the clutch... They learn pretty quick I don't like being followed too close.
Think about this....if they hit you because they're on ur azz big time and you make abrupt moves, what do you gain? Damage to ur car? oh yeah they're in the wrong but....who wins? and what if they don't have insurance?
Better to just slow down gradually or vary ur speed a bit and let em pass you. Avoid a confrontation or worse.