This is right wing rhetoric.

'If you don't like it, then leave' is a nationalistic approach that is unhealthy for a country and it's people. It's also inherently ableist as it assumes that anyone who doesn't want to be somewhere has the means to be able to leave easily.

Pretending an entire nation of people support the presiding leader is also pretty naive and would likely get you flamed if you said it about other hot button countries such as Russia, China, Palestine, Israel, Iran, or any of the multitudes of countries that have problematic leadership.