there is never any excuse for tailgating - even if the person is going a fair bit slower than the speed limit - i am surprised at so many trying to defend or make exuses for it
if you stay back but flash me once or twice, i will move aside happily, as i would take that as a polite request. ... but if you drive a foot away, snarling and waving your arms about, then i will not only stay where i am, i may even slow down depending on my journey schedule - you act threatening to me then i will just *** you off ...