I've only had one thing that has bothered me during fishing and that is someone coming up and seeing if I have caught fish while their and my line was out causing us to tangle up. Nothing I get too upset about and quick to fix but worth mentioning. I have had boats do worst where they come to talk to me and then motor across where my line is catching it in their props, take off causing me to have to snap my line. Frustrating!
I'd say if you want to talk close to someone reel in your line (this is what I do) or pay attention to where both your lines are. Be careful going up behind someones kayak while they are trolling.
Besides that everyone is out there to have a good time, so enjoy yourself and the surroundings around you. Everyone I have met on the water besides the sail boat lady on SD bay have been good friendly people.