I'm not convinced I owe nice attitude to someone who hates me and wants to destroy me and my way of life.

I mean go nuts with that for all I care. But the refrain “then just leave” is the most unoriginal and vapid comeback. If someone has a bad opinion or argument then it shouldn't be hard to come up with something better.

Absolutely anyone under any regime—British or Iranian—can say “then leave if you don't like it”.

This is just pulling a strawman argument. I'm criticizing the West for precisely destroying the way of life that you have had, in favour of some misguided sense of tolerance intermixed with arrogance. I don't need to destroy you or your way of life, because a.) I don't think about you at all and b.) you and your government are already destroying your way of life.

One can respect the freedom for someone to have an opinion and simultaneously criticize that opinion and its hypocrisy.

Well he didn't criticize my points or barely even read it, since my monologue was on hypocritical Western European attitudes (after all, I implored GP to "talk to his fellow countrymen in the rural parts, outside the city shells".

Instead, his retort was to tell me to pack my bags and eff off.