Why are people in grocery stores so mean?

Those annoying ignorant people are every where ...not just grocery stores. Unfortunatly they think they are 'better' then the rest. Whatever....her daughter will grow up to be as abig of a snob as her cause some parents teach their children to be just like them. Dont worry those rude jerks dont need to be a part of your life..surround yourself with 'good' people and let the jerks be jerks.