People who only ride their horse 3-4 times a year and then wonder why the horse acts up.
Unfriendly horse people
Know it all horse people
People who don't understand the concept of "everyone has to start somewhere". So you've been riding for 100 years, I'm here to learn from you not be insulted by you. Take a courtesy pill.
I think I see a theme here...Oh crap, its people who irk me
Guess that's why I spend more time with my horse than with people.