The true test of good manners as my daddy taught me is the ability to put up with others bad manners .
but for sure and I agree whole heartedly its about flat out frustrating to try to ketch a fish peacefully on most public waters these days, even us bank anglers get a beating from boats in many cases . they run a creek I like making monster wakes and its a wildlife sanctuary no wake zone with tons of law enforcement boats writing tickets and it never ceases in the winter when the crappie go up in that creek .
so you see they don't even respect the law enforcement in there and rarely give a rat if you say something to them .so in synopsis I again say this about that , bite your tongue and let them go on their way and you will likely get over being upset long before you would if you lose your cool .
my 2 cents