Well, fishing used to be...oh great he caught a fish! (no matter what method). Now it's more like, "oh, he caught fish, let's observe how he did it to ensure he's following rules. If he isn't, he shouldn't be here, etc. etc."
Jeez people, if you don't like it, walk away! Or confront them verbally in a friendly manner like i do. I haven't had any "boiling-over" issues yet, but chances are, they will be nice about it and stop whatever it is they were doing to you that caused you to confront them.
Don't try to "police" people, you are there to fish and enjoy a day off work or school, not to police or stress.