UK Border force often " unfriendly " too. Just doing their job.
This has been my experience at Heathrow and Glasgow. Not actually rude, but not friendly either. And lots of questions about where we are going and how long we are staying.
To those commenting that border officials should be nice because you are spending money in their country, the other side of that is that people who overstay often become a financial burden on the country of entry.
By the way, as to the financial impact, we Floridians do appreciate your willingness to spend money in our state. Tourism, and the sales tax revenue it generates, is the reason that we don't have a state income tax. So for all of you who wait in those long lines at Orlando, thanks for that. 