I use chopsticks regularly in New York. Wood feels nice to eat with.
I eat with a spoon a lot in Thailand. To be honest, I picked up the habit from hanging around with bar girls.
It looks crass, but I don't care. I'm on vacation.
My favorite chopsticks are from Thailand. Hard wood, not slick and with gently curved ends.

It's simply lack of knowledge on Thai customs - the same thing that sees newly-arrived morons, sorry, I mean tourists, making a Wai to hotel doormen, or turning up at wats in boob-tubes or shorts and thongs, or repeating requests in louder and louder voices when it's simply the case that there's a language barrier. Still, just keep on collecting their money, as #5 points out, and the world will keep turning.t
It's simply lack of knowledge on Thai customs - the same thing that sees newly-arrived morons, sorry, I mean tourists, making a Wai to hotel doormen, or turning up at wats in boob-tubes or shorts and thongs
give me a break... the question in the OP should be why don't Thais use chopsticks to eat their rice, not why do foreigners do so.
The idea that someone would use chopsticks simply to try to impress someone is ridiculous. Actually, the idea that anyone would be impressed that someone can use chopsticks is even more ridiculous.
Sounds to me like there are a few people out there that are feeling inadequate because they haven't mastered something as simple as using chopsticks, hence their criticism of those people...
Don't know about Europe, but many "Thai" restaurants in the States put chop sticks on the table. It's one the tells as to whether to hope for any authenticity.

it takes years to master the thai fork and spoon technique. Why can't they just use one or the other, they are both doing the same job. I like to take my food take out just so I can go home and eat it with a spoon only, and spare myself the painstaking fork and spoon routine.

#14. Know what you mean. Whilst there are obviously notable exceptions, Thai food outside Thailand is mostly very ordinary. Recipes are toned down for foreign tastes, and often padded out with extra non-authentic ingredients to maximise profits. I had a memorably awful Kaeng Kari Kai (Chicken Yellow Curry) in a Brisbane Thai restaurant on a visit last year - it had at least 6 varieties of in-season (i.e. cheapest) vegies, and about 5 scrawny bits of chicken, and tasted nothing like its Thailand version, which of course has no vegies at all except for onion and garlic. Yuk.
Chinese food outside China and Vietnamese food outside Vietnam tend to survive closer to original recipes than Thai does, sadly. Whether you eat Thai with choppies or spoon/fork makes no difference in making iffy food taste better!

My wife worked in a Thai restaurant in Vancouver, Canada for a while. They would give people a fork and spoon as is normal in Thailand. She used to get customers complaining about this, saying 'because I'm white you think I can't use chopsticks, give me some chopsticks now!'. Needless to say all the staff would then be laughing at the guy trying to eat his green curry with a pair of chopsticks.

Most noodle shops have chopsticks, but also spoons and forks, so you can decide what you prefer. I eat noodles with chopsticks and a spoon. Never use chopsticks for rice except in the Japanese restaurant we go to sometimes... they only give you chopsticks.. and the rice is very sticky. My goodness, a lot of answers for a troll!