Casey is one of Rafael's dance children, so he's inclined to be fond of him but I imagine there's some tension there because they're both control freaks and Rafael's very alpha in dance. A quieter alpha than Sy, BUT STILL. He's also a control freak in Gaming Club and LARP and long story short Casey has a lot of Rafael trying to knock him back down to look forward to SORRY.
Reid is... Reid. He doesn't want to fight over whose bromance is best. I imagine he's actually pretty fine with Casey but Sy's always dragging him into these stupid wrestling matches ughhhhhh. Reid may have been up for making out with Casey in the past before Sy yelled at him to stop this year because LINES ARE BEING DRAWN.
Diego will know him a little through Drama and general party shenanigans!
Aaaaaand Calvin just hates him on account of being a Coppertale junior boy who seems to be buddies with Sy. He could have bullied Calvin if you want but Calvin's Not Over It if that's the case. NEVER FORGIVE NEVER FORGET.