There are tons of magicians that hate it when people show the magic tricks. Honestly I’m not sure why they’d dislike it. When you watch a trick you are encouraging someone that’s into magic on some level. You are also not being a jerk.
I understand that there’s a common magic trick that people show us and it’s a horrible trick and quite often the person fails to find the card because they don’t practice enough. However you never know when you are going to see something interesting.
Here’s a bartender that saw Chris Beason and I jamming magic tricks and offered to show us a trick:
While the trick was a math based trick, it was something I think I had read as a kid, but had never seen anyone do it. It was an interesting trick and while not the greatest trick in the world, it was worth watching 10 bad tricks to get to one that was fun!