The stereotype of being a teen/school kid, even shops have signs saying only 2 allowed in at a time...it's discrimination
Pretty much everything about American culture.
Drive-ins. I rarely eat fast food, but one time when I succumbed I got rear ended by a crazy woman at a McDonalds. Her car slammed into mine. She then when I got out of the car and talked to her proceeded to make it all about her when I told her she had scared the hell out of me (my car was ok). I no longer go a drive-through of any kind, anywhere.
I'm trying to think of something I don't despise. Nope can't think of anything.
they can be very judgmental.. if you are not a virgin before getting married you are a ****..but thats just the older generation mentality..the younger generation are ok
blind patriotism which supports wars for oil
The love of guns and violence
The Aussie alcoholic mentality.