This is bad manners in any country and if you did that in America or Australia the person behind the counter wouldn't serve you and you'd get a black eye from the person you cut in front of.
Most Thai people are very friendly and have no qualms about talking to strangers as long as you don't look like a deadbeat or drunk.
The truth is the reason why 2 people are employed to do the job of one person is because Thai people are so lazy if they have to work hard, they'd rather not work at all, they are more likely to take a day off so employers are forced to hire two people for the same job. Take for example the case of the ambulance, you'll never see Thai drivers pulling to the side of the road to allow the ambulance to get through, they wouldn't even do it for a police car let alone an ambulance, it can't be because everyone in Thailand is in such a hurry, they simply don't care, they only care about themselves.
Thai people have just as much opportunity to advance their own country than China does, yet they are far behind, why, because Thai people are lazy. Yes this is because Thai people are too lazy to get a bin, if they get a bin they will have to clean the bin because people throw waste into it, they are too lazy to do that so instead they'll just throw the trash on the side of the street and wait for the government to pick it up, oh yeah you only pay 30 baht a month to have a bin also but instead they pay nothing so they don't have to deal with any of it. Another great example of how Thai people are selfish is how they are always late.
The cheapest sponsors you can find are Thai university students, these girls have only two things in mind, studying and getting good grades, as well as partying and having the latest gadget to show off to their friends.
Typically the ones who want a sponsor are those who really are determined to finish school but their parents are having trouble paying the bills, these girls are the ones you want, their eager to please young, and will be extremely grateful for your generosity.
This is a very objective view of what Thai people are really like, however the truth is the truth.
Anyone who has lived in Thailand for more than a year will know how lazy, selfish, and bad mannered Thai people really are.
As for Thai manners, it seems once a Thai person leaves high school, all the manners they have learnt cease to exist and they live the rest of their lives with bad manners to anyone they come across whether they know them or not.Sponsoring a Thai girl doesn't mean she'll be faithful for you nor does it mean she'll be around when you want her either, but there are ways to ensure that you get what you want. I've heard radical stories of guys giving their sponsor up to 100,000 baht per month.This is ridiculous, the average Thai wage is 6,000-8,000 baht per month so why someone would need that much is beyond me.You can blame traffic (leave earlier), you could blame the slow pace of life (hardly, Bangkok is a booming place), the fact of the matter is Thai people don't care about your time they only care about themselves and being late is not because they didn't mean it intentionally they did, they were doing something else and didn't care that you were waiting for two hours to arrive.Contratry to popular belief about how polite Thai people are and how respect is a huge part of society, the truth couldn't be further from the truth.