Silly Locker Room Routines

I visited a Gold's Gym in Harrisonburg, VA with a free pass from my hotel. The gym had a mix of people from college-aged guys to older from in shape to kind of normal looking people. When I was finished working out I went to the locker room for a shower and to change back into regular clothing. The guys were very funny! There was one guy who was sweating very hard from his workout and he wouldn't change clothes. He just threw on jeans and a hoodie and left. I thought that was gross. There was a younger kid, maybe 12, who had been swimming. He was wearing a speedo and couldn't care less if he was naked as he went to shower off before changing to leave. His dad was in with him just waiting. Then there were some towel changers and other guys who seemed really scared to strip down. What I thought was funny is some of these guys acted to tuff out on the floor when they were working out yet were worse than scared little kids in the lockerroom. I can't figure out why they are so afraid to change clothes or take a shower.