How would you deal with a rude sales person?

knowmeyourself
Like if you were shopping for expensive item(s), and he says something like "...you take too much time to decide" along with a face gesture that's very rude as if he can't stand you.

Aren't you supposed to take your time comparing items and choosing the one that you'd prefer? especially if it were expensive.

How would you deal with such a sales person?
Updates
+1 y
What if he were a clever salesperson? maybe the most clever of them all i.e. most experienced. Will you still ask for a different person to deal with?
How would you deal with a rude sales person?
16 Opinion