Anyone who denies the law of non-contradiction should be beaten and burned until he admits that to be beaten is not the same as not to be beaten, and to be burned is not the same as not to be burned. ~AvicennaAnyone who responds to a discussion about objective reality by saying, "That's might be your objective reality, but it's not my objective reality!" is not worth the time that talking to them would waste. They are really not worth the time taken to interact with them in any way. The sole possible exception is, per Avicenna, the time it would take to beat and burn them. And they are only worth that because it is the only kind of argument they are capable of understanding.
Edited to add: I am not, of course, suggesting that anyone actually beat and burn relativists, at least not without first consulting with your confessor. Unfortunately, I have yet to find a confessor who looks entirely kindly upon my beating people and setting them on fire. Not even if it is for the best of reasons.