It did not appear from your comment that this was a person in the west socialized to think like that but another immigrant who thought like that. Which makes it a completely irrational response. The fact that they weren't tolerant themselves of others like themselves is what makes it utterly surreal.
If there is one thing I'm proud of for NL (and I can't speak for the UK, I haven't spent enough time there but I have spent enough time in Canada to have some idea of how things work there) then it is that for the most part people here get along. My kids have friends across all cultural groups here and they visit there and those kids visit here. Never a single issue.
The only issues that we do still have is a lot of latent racism in small towns and concentrations of crime (across all cultures, including those lily white Dutch) related to drugs and such. The people that want to blow this out of proportion are the ones on the far right, typically their main reason for their stance is that they are afraid that new entrants are going to compete with them for social security. And to some extent they have a point.
But refugees should always be permitted to flee from wars, famine, natural disasters and whatever else can happen to people outside of their control.