That's true, they often ask me if I will take them back to San Francisco with me to visit. But tell them I don't like being away from Thai food so I have not left here in over 10 years. I've done several selfies with them as well :-)
So sorry to hear that, I've never witnessed them showing disrespect to any foreigners in 15+ years of applying for my 90 day extensions (60+ visits). Pretty amazing given how many people they process on any given day. Just be polite and wish you luck!