The most common and most likely answer to this crossword clue is the 5 letter word BOORS
I've seen this crossword clue in Financial Times
B
O
O
R
S
More clues leading to the result BOORS
Buddy explains!
The straight part
We know that "Rude people" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rude people = boors.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BOORS mean?
BOORS noun- A peasant.
- A Boer, white South African of Dutch or Huguenot descent.
- A yokel, country bumpkin.
- An uncultured person.