Just reading this story and saw some nice anti-hull graffiti. http://www.dailymail.co.uk/news/article-2689385/Grimsby-gets-Borat-treatment-Anger-depressed-fishing-town-backdrop-Sacha-Baron-Cohen-s-new-blockbuster-hooligans-binge-drinkers.html
That T shirt came to mind as I opened the link. It's available as a mug too. It's possibly more true of reading the Mail Online comments section however.
I think those photographs flatter Grimsby. Woman on Rugby FM yesterday describing the delights on GY by the sea aka Cleethorpes. Question; What are the attractions of Cleethorpes ? Woman; You can actually see the North Bank on a good day.