I don’t know how others feel about this but when either myself or my partner are working a lock and there is another boat waiting to enter or if we are in the process of waiting. We always go to the lock and help or offer to help those already there. Appreciate some people don’t want help as they do things their own way.
For me I would expect the boat crew waiting to enter the lock to approach those at it. I’ve often called down to an on coming crew how they want the lock left in readiness for them.
Lets face it. You can pick up some good information in a brief exchange with people at a lock.
As for abuse. Alas there seems to be an increase in boat rage these days. I won’t start the topic of cruising past moored boats. I can tell you some stories about that which will make you worry, including having objects thrown