People that repeatedly say things or make promises they can't keep, or don't have a good chance of keeping. Just for the sake of apperances or a positive answer to avoid disappointing.
I have friends and acquaintences around the world. But whenever it comes down to Americans, it's overwhelmingly broken appointments. I drove up to ski today with the expectation I'd meet an acquaintence after he finished work at 17:00. "Sure, yeah that sounds great, see ya then" he says a couple days ago. It truly wasn't the only reason I went skiing (I love outdoor activities), but it was a reason I paid extra for an afternoon + evening ticket. Plus, I've skiied alone my whole life so it's nice to have a buddy to ski with. So I ski myself the afternoon, and around 16:40 I take a break and walk to the ski shop where he works........."oh, he just left, I think he went home" says an employee. At 17:15 I get a message "I'm at home" from him. Sad, but no surprise.
I'm so fed up with people who can't give "no" for an answer, and instead promise something they then edit or change at the last moment. I plan my life out in advance, so it's mildly disruptive when I schedule time with people, yet I know that if they're American, 90% of the time it won't happen. Expected over the years, but it still irritates me to this day. I know plans change, life happens. But if you aren't sure, or have doubts.........just say what you mean!
With my European friends, they mean what they say. No means no. "I have to check, but will get back to you" is totally fine and they actually get back to me in a couple days. And when they agree to something.......it actually happens ! Imagine that !
