most of the time, boomboxes were used among willing crowds( this was back when going outside was really popular). Only a few times would you have some attention seekers blasting them out in random public. I don't compare them to cellphone blasters, because I have seem a lot more of those than I have annoying boom box users.
Yeah, you would be sitting at the park with your pals or whatever, only you and your pals would be listening.