Bulls are all jerks.  Some way worse than others.  Talked to a guy along time ago that fed a lot of cutting bulls and he finally got so pissed off at them he made a special pen that had telephone poles horizontal to the ground over head at 7' spaced every 10' so if they tried to mount each other they would hopefully get cleaned off by hitting the the poles.  Sounds like a lot of work and money for entertainment.  I do know that they can get ridiculous.  I feed a lot of cutting bulls and they are typically dicks when they first show up.  They will kick dust up all day long for a week mounting and sparing each other.  I just don't look at them.  Very rarely do they have health problems from pounding on each other.  Fence issues on the other hand are a regular issue!