I find it so jarring when visiting - not so much thanking (I would say thanks/cheers in those situations in the UK too) but the way it's taken (or so it seems)

I find it so jarring when visiting - not so much thanking (I would say thanks/cheers in those situations in the UK too) but the way it's taken (or so it seems) with such sincerity or like it was a huge thing that really needed to be thanked. 'Thanks.' -- oh you're so welcome! It's completely arbitrary really, it's just really noticeable and, well, jarring when you're not used to it/used to different. I'm sure it's similar in reverse (I thanked him and he was so grumpy about it, didn't say a word! (Or he just said 'cheers' back, I didn't buy any alcohol?)).