To be honest, coming from a riding background also, I think it has alot to do with the horsey industry. I have been involved with quite a few centres schools etc and ALL of them have been run by snotty uptight woman!

My Aunt even runs her own school and stables and although I adore her I can imagine she would be horrid to her customers- I think it may be the type of people that particular profession attracts. She is also in the position of needing clients but I doubt for one second that would improve her customer service skills.
I have no ideas for what you should do though sorry- I personally just kept my contact with these type of people to a minimum. Good luck with it all!