A week or so ago we were heading south from Aynho Wharf, having filled up with diesel. After the bridge, there’s a long line of long term moorers, one of whom jumped out of his boat and shouted “that’s not tick over, you’ve rocked our boat”.
Rather than ignore him, I said “it often helps if you tighten your ropes more”.
To my great surprise he didn’t shout abuse, but went back and tightened his ropes!!
So I think maybe a lot of boaters don’t realise their 6 foot of slack rope fore and aft isn’t the best arrangement!