We are told over and over that women are equal to men. We don't, as men, worry about staying on our boats. Therefore, if we advised women that it may be dangerous, we would be sexist.
I disagree with this on many levels.
First, don't conflate "women are equal to men" as women and men being equally vulnerable to certain types of crimes. You are creating a specious argument where none existed.
Second, who exactly are you referring to as "we" not worrying about staying on our boats? Do you speak for all men? I'm a man, and I take all the same precautions for myself when overnighting - every time - that I describe above. Stuff happens, regardless of gender, and it's easy to take a few simple precautions. Perhaps you are a little sexist for assuming no men worry about this (OK, maybe you are a LOT sexist).
Third, telling people they are sexist for advising women take extra precautions is beside the point. Go ahead and finger wag while the rest of us go about our lives in the real world. Suggesting precautions is very different from telling people they can't/shouldn't do something.