people classify people because it makes information about certain demographics more convenient so they can make a quicker, well-thought out and hopefully logical decision. there is nothing WRONG about classifying people. you want examples?
advertising agencies do it all the time. what kind of people would most likely buy a van? oh, parents!
auto insurance agencies do it all the time. is the kid a teenager? oh, he probably doesn't have enough experience on the road, so his risk is greater.
credit card companies do it all the time. the guy has a sub 500 credit score, he's probably a huge credit risk like these other people who've had the same score.
you guys are getting too antsy about the moral issues of classifying people and the truth is, there is no moral issue. the real problem is how you even got to your conclusion of the people you've just classified. does it make sense? are you getting enough data to come to a conclusion? are you simply biased? those are the questions you need to ask yourself.