I'm not sure what the problem is because if you ask anyone in your neighbourhood in the west (who is not brown/indian), then they will tell you something similar when describing sikh people.
They will most likely say that there are 2 types, the orthadox one's with turbans & beards, and then the ones with turbans/trimmed beards or haircuts that can hold their drink and can always be spotted in the bars having a good time !
Some years back I was actively involved in a survey that asked general non-indian citizens 'what they know about sikh people ?'
The most common answers were-
-They wear turbans.
-They wear this steel bangle.
-They are hard workers always accepting overtime and awkward hours.
-They have their own business in nearly every field, ie.Doctors, lawyers, accountants, bus drivers, taxi drivers, food stores...etc..
-They have these great big weddings with loads of free flowing food and liquor!
- The men can Handle and Hold their drink !
- They are very friendly and generous
- They know how to have a good time and party especially when they do that bangra dancing !