It's not intended as a proof. If you need proof that these behaviors exist, I'm afraid you'll have to spend some time in retail spaces.
Personally, I've seen all of these - and then some - simply by visiting shops in my daily life and knowing people who've worked in those places, and I'm reasonably sure that most people have as well.
Personally, I've seen all of these - and then some - simply by visiting shops in my daily life and knowing people who've worked in those places, and I'm reasonably sure that most people have as well.