I clap both teams on, I don't sit and think should I or should I not? I also clap a good try scored by any team playing. Its down to the respect I have for the players. It put it all into perspective at the weekend, my son was playing in a tournament at Chorley Panthers where the air ambulance was called for an 11 year old with a head and neck injury. Thank god he was fine but watching anyone of any age play this game has my full respect.

Things i do at the games i go to:

Boo Wigan and Saints, it's more a banter thing than any form of disrespect as i have plenty of friends who support both clubs.
But i do the kind of no clap thing in which you bring your hands together which qualifies loosely as a clap.
Other clubs i applaud.

Player injuries, the initial big hit and the player is groggy looking gets a big cheer but i always hope that it's the kind of impact injury that's shaken off after about 5 mins and does no damage beyond that. Anything else and i show genuine concern, yes, even Ryan Bailey.

A fair call
When a decision goes against you, if i agree with the call i'll always say 'right call' even if the rest around me cry foul.
Same with video ref, during the big screen replay, i say 'i wouldn't give that' against my own team.

Alway clap a good try no matter what the score or who the opponent is, again i've had funny looks for this but i don't care, if it deserves it , it gets it.