It has been a tradition since the days of the working boats to acknowledge each other with a cheery wave - join in! Don’t be selective about whom you acknowledge and don’t forget other waterway users - we are all trying to enjoy the same experience. There really is room for all lovers of the waterways whatever their interest.
It costs nothing to be considerate and allow for the other person’s inexperience. A disagreement or a frustrating experience can stay with you all day, make you less relaxed and more likely to make mistakes. Take it easy - there are no prizes for being first!