Wrong. I used to live in Seaside and Toms River and I can tell you from first hand experience that nothing will stop people from NYC and North Jersey from coming down and fucking things up.
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Seaside Heights is disgusting.
Try one of the quieter beaches less prone to the weekend warriors. Avon maybe. Long Branch is nice, too. You get the beach without the litter and crime.
Jersey Shore was nice. Didn't spend too much time there, but it's definitely a group spot.
Manasquan and particularly either the bar Leggetts or the Osprey is where it's at on the weekends.