you will find I come back with more "Thats Crap", generalisation from your example football is weak because its nothing to do with types of people and this subject! eg white, thai, western etc.
I understand if a women thinks "All men are dogs" because of past experience but she is just bitter and wrong in her view as not all men are dogs and I put money on the fact she has not met "all men"
A generalisation IS pre-judging someone, if you make generalisations on groups of people/skin colour/race (NOT football teams!) from a small number you are pre-judging whole groups of people.
If people don't have a problem with generalisations on people's skin colour or where they are from then its their view, each to their own