A couple of guys were magnet fishing, and this guy did not like that they were on a bridge that had no signs on it to stay off.
No matter what you do outdoors, someone will always be upset or offended—that’s just life. The key is to focus on what you can control: follow the laws, respect others, and stay true to yourself. As long as you’re not hurting anyone, there’s no reason not to do what makes you happy.