Hello Mother duck,
What the guys are saying is there has been a nuisance person making ridiculous comments in here and getting the regular forum users annoyed, some of us are a bit skeptical when an unusual post is made here.
The best people to look for are the guys that sail in QLD like Hobie14T, Haircut and DavMen. Go and have a look in the Speed sailing forum to find them.
The reference to crack is in relation to your avatar picture, it can appear to look like crack cocaine, I am sure it is a very nice crystal or a whopping great diamond, so the guys are making jokes about that.
You may also want to try QLD sailing clubs as well.
I hope this helps you understand a bit more about us, we are a foolish yet kind mob, except when the wrong people make their way in and become a pain, you are not one of the bad types as far as we can see which is why I hope that my explanation has helped.

Regards GT