That’s not racism Robroy, what you did was basic profiling, which is an accepted tool used by the security services, airport security etc. It’s by no means foolproof but it does tend to target resources to areas where they should be targeted.
Next time you enter an airport take a look at the way any Asian traveller is scrutinised. Perhaps it’s not fair, and in an ideal world it would rightly be deemed unacceptable, but we don’t live in an ideal world sadly.