IIRC we were to an extent. I'm pretty sure when my ticket for the game arrived in the post there was also a note in there from the club requesting that we respect any tributes/silence. With regards to the media, the week leading up to the game was horrendous. Some media outlets were so certain that our fans would disrupt things that we were effectively tried and convicted before the day of the match itself. That fuckwit Terry Christian was also on local radio all week shit stirring and calling City fans scum. Even Paul Scholes - who back then never seemed to give interviews - stuck his head above the parapet and said that while he hoped we'd respect it, we had previous form for not doing so.
To be honest, I wasn't 100% confident that all our fans would respect it and it only takes one idiot to ruin things. Oddly, I bumped into a United-supporting mate who was stewarding in the away end. Ex-hooligan but a top lad who always looks out for his mates regardless of who they support. When I asked him if he thought they would get their minute without any interruptions, he was adamant they would: "Yeah, course they will". And so it proved.