Assuming it is somewhat well signed then the guy is a jerk.
I feel for him though if he was just out for a hike and decided to wade in without knowing it was restricted access.
I did something similar a long time ago when we used an old guidebook and went kayaking in a river that was made off limits due to a protected species that wasn't protected at the time of printing. There was no signage, even in the parking lot that we used for the put in.
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