I've had my fair share of not nice 'guest postings' at various times but would hate to be without the ability to post as a guest for many of the above reasons e.g. Secret Santa fun, posting at work, not to mention new people who may prefer to try out the site before they join up. I think Joe Offer does a reasonable job at keeping the nasties out of the forum but every so often there will be some that slip through. Best just to ignore their comments.