I find it totally inappropriate and pretty arrogant, not to mention judgemental.
When people go to the doctor's they might be feeling very unwell, be in a lot of pain, have experienced trauma, be stressed out or a million other things.
I find it disgusting that the doctors think they have the right to judge someone's personality from the appointment and then comment in such a way in the letter.
I haven't come across it in other countries.
I mentioned it to a friend whose husband is a consultant, and she said to let the doctors have a bit of fun!
I do believe it's a code to describe the patients and by omitting whichever adjective they'd normally use ('delightful' , 'pleasant' , 'charming' etc) they are letting the recipient of the letter know that they didn't like the patient or that there was some issue of some sort.
There is so much wrong with the NHS I don't know where to start, but having the medical reports kept to the facts and stopping sending underhand bitchy messages about patients would be one good thing.
I have also been labelled 'pleasant' etc and thought half of the letter at least was a load of waffle that would have saved time to miss out.
Also, why do they post appointment dates and follow up letters out using paper and envelopes? This is 2020 for goodness sake and I thought they had a funding crisis?