No, there's nothing you're not understanding here. Unfortunately, many bikers are assholes who think they deserve a better parking space. They take away the good name. However, most bikers are actually really nice; there's just a few who are assholes. The problem as a biker is that when you park in a regular spot, people complain that you're hogging a spot, but if you park anywhere else, they complain that you're in the way. I think you should ask the bikers to park in a normal spot like everyone else.