Two really odd pet peeves here of mine from both when I was a host/waitress and also when I'm out and about.
When there's a sign that says "Please seat yourself" and people stand there and stand there, and do like what the OP describes.....whistle or yell or throw temper tantrums to get sat right meow...
People who see the "Please wait to be seated" sign and go ahead and sit themselves right at a dirty table, then proceed to give all the staff dirty looks. Or people who I was trying to seat, and I'd go to put their menus down, and come to find out, they didn't even follow me. They sat wherever they wanted. Is it too hard to just ask "Miss, could we please sit here instead?"
The funniest offenders of this one were the senior citizens at the Norwegian restaurant. They'd come in hoping the hostess wasn't at her post, and they'd try to sneak by as fast as possible so that they could sit wherever they wanted. Even though unless it was totally swamped, it was no big deal to accomodate people's requests to sit elsewhere. In all honesty......I was 14-16 at that time.....obviously I was much faster than an 80 year old couple trying to whizz past me with their canes and walkers. But I guess they really, really wanted their special spot and no one was going to sit them elsewhere!
You really need to see a neurologist. - Wagegoth