I can't say I've ever had any problems with security people at airports. A lot of the complaints sound like people being asked to do things by other people they feel superior to for some reason - they don't like the feeling of superiority being threatened since it impacts their feeling of self worth - all very sad. US immigration officers also all seem very polite to me.
I did think it was funny to hear an airline chief complain about a safety system being redundant. Isn't redundancy one of the things that makes air travel so safe - like "redundant" hydraulic systems?