Truth is subjective! Because... er...uh...

It's humorous to me whenever someone claims truth is relative or subjective, and then proceeds to spout off a number of propositional statements ("X is ..."), which to some intensity they will actually defend against another position, as if those statements they made are (read carefully) something higher than their own personal opinion. Every statement you'll ever make can, by your own admittance, be simply and easily defeated by the counter claim, "well that's a nice little autobiography into your subjective thought, but really that's nothing more than your subjective opinion". End of debate.

Be consistent. If truth is subjective, then there's nothing you hold to that can be rationally argued for. Any rational argumentation presupposes the absolute truth that valid reasoning is always preferred over invalid reasoning.