2014 was a bad year for yelling at refs because of how the gameplay worked. It didn't help that one of my team's best defensive strategies was ramming into our opponents at full speed (~16 fps that year- 3 CIM drive), which sometimes created unexpected situations
Also, I notice that I
usually (students do it too) see these issues with parents/mentors; which I think shows that FIRST's attempts to indoctrinate us with Gracious Professionalism might be working
that being said, I dont remember ever seeing a full-blown fight