Remember, there was more than one lad. On the video I saw on Facebook, he certainly wasn't covered up as he was waving his arms about as he ran through the crowd.
Personally, I don't think it was that big a deal. If I had young kids though, I might not have been too happy. The difference with things like Page 3 girls, of course, is that you choose to look at them, whereas the Boxing Day Dip is a family event.