My pet peeve is boaters who do not know how to tie basic knots or even do a cleat hitch properly. Some people who don't know how to tie a knot correctly make up for it by just tying a lot of them. <img src="http://www.catsailor.com/forums/images/graemlins/crazy.gif" alt="" />

And it is amazing the number of powerboaters who do not know how to tie their boat up to a dock -- and don't even have enough line aboard to do it properly and have never heard of spring lines and breast lines. <img src="http://www.catsailor.com/forums/images/graemlins/shocked.gif" alt="" />

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Also, I am surprised that nobody has yet mentioned a primary pet peeve of sailors: Personal Watercraft!