Steve at The Firearm Blog commented on a case of profiling and discrimination in his post "Extreme Sexism at Walmart: Woman Can't Buy Big Guns." Though I'm not as torqued off by the sexism of the incident, I do think it is sexist how the employee treated the woman. And probably ignorant.
But the employee was apparently doing his job by profiling the customer and possibly preventing a straw purchase. And in most cases, he probably prevented a victimless crime, because no matter what the government says, it is not a real crime to possess a firearm.