Little Italy and China Town maybe xenophobic and pejorative, but only if those names don't really exist.Little Italy is OK?
China Town is OK?
I lived in a place tagged as Little Britain when I lived in Australia.
Why is London Londonstan so different?
But names like Chinese Quarter, Balti triangle, etc refer to sepcific areas where one can find the sort of retail outlets one is looking for. They're not intended to be pejorative.
If you called your daughters bedroom a sh1thouse, it would be intended to be critical and pejorative. But referring to the toilet as the sh1thouse is not pejorative, because that is what it is.
Londonistan does not really exist and it's intended to be pejorative.