I didn't see the original thread, but think I get the idea.
I have never been pissed off about getting to a spot and seeing someone I know there. If someone I don't know is there, yeah, I could get pissed
If I bring someone to one of my spots, I better have a good idea about the person's character before doing so. If we get into some fish, would I expect them never to go back??? Not a chance, and they could expect the same from me

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If you want to fish alone all the time, then don't bring anyone with you (my inner Yogi Berra talking).