I have noticed it's mainly conservatives that say this. Not all of course so don't get triggered. Why don't they just admit we have our problems like every other country? Saying "if you don't like it get out" won't fix a damn thing. Instead we will just continue to have our problems.
Most Helpful Guy
Probably multiple reasons.
First, a lot of conservatives are nationalistic.
Second, conservatives are much more independent, while liberals come across as whiners who want everything handed to them. Conservatives have no tolerance for that.
Third, conservatives tend to seriously hate liberalism, so any excuse at all to lash out is valid.
Forth. Impatience. Conservatives are sick and tired of being pushed around by liberals who always get their way. So their patience to engage in real dialog has been worn pretty thin. Simply telling them to get out is much easier than actual dialog that falls on deaf ears.2