I'm sorry but consider that this right here is discrimination too. Go to Costco in Markham, Ontario and you're going to be seeing a lot of chinese people in the way you describe too. But then consider: when was the last time you stepped into your local hmart (a Korean supermarket chain)?

People congregate with similar people. This is something torontonians have gotten over ages ago. Mingle if you want to, but also accept that not everyone is a lend-sugar-to-neighbor international social butterfly. NIMBYism isn't going to help.