Because Stratton Oakmont are a rowdy, uncouth bunch of man-children who represent the modern, corporate version of Lord of the Flies. Steve Madden was famous for designing shoes. And, not the toxic masculinity hunter culture that Stratton Oakmont represented. That was their way of welcoming/hazing what they considered to be a beta male.
Heaven knows what they would have thrown at the owner of Fredrick’s of Hollywood. Some athlete, athletic equipment manufacturer, car/motorcycle builder, or firearms producer might have gotten a similar, yet more respectful, greeting. Just as boisterous without the fear of getting pelted with products. And, Hugh Hefner’s or Larry Flint’s welcome would have been legen...(wait for it)...dary.