The rules are complicated, as a non-native English speaker it would be very easy to get caught out. Brit and Aussie are fine, Jap and Paki are pejorative. Best

The rules are complicated, as a non-native English speaker it would be very easy to get caught out. Brit and Aussie are fine, Jap and Paki are pejorative. Best to use the full term if in any doubt.