It's like how some people get starstruck when they see a famous celebrity or athlete up close if you're comparing someone who's a tourist in Los Angeles to someone who's lived there for 10+ years...
If you go to a Drew League game and Nick Young walks in the gym, some folks are gonna be like "HOLY shyt, THAT'S SWAGGY P!!!



"
While others are gonna be like "

Nick Young showed up today. I wonder, does his team have a game today, or is he just here to watch?

" and that's as far as their excitement goes.
Some don't see someone that interesting very often regardless whether the person is famous or just really pretty; some people see either on a regular basis and it doesn't phase them as much.
Some geek out, some act like they've been there before...
It all depends on the person.
Some people do go overboard and like they have no sense....
Those cats need to

and gain some composure...
Acting like a groupie and shyt.