I'm really sorry your group was hassled and provoked. I can't see the point and it's completely unnecessary. You can't begrudge fans celebrating a win if that's all they do but there's no need to go on to have a go like that.
As for the Hillsborough silence, I can understand if what was going on was not understood or it was concourse singing (I remember thinking it sounded a bit remote at the time). I've read others here saying it was deliberate and I guess you always get a few but even a few is worth the apology in this case.
What's worrying is the worsening of attitudes between clubs. It's always been a decent club and I for one was happy when City won it that first time in such a long time (even happier when we won it after a similar wait of course). Seems there's an increased nastiness on both sides - on and off the pitch, which is a crying shame. The closer teams are the worse it seems to get but City and Liverpool have been close enough recently (and City have had the better of it in the PL at least), so I don't get the change or why it's happened.
I was watching a video of a fan on YouTube, who was absolutely obsessed with doing down the fans, repeating stuff over and over. Clenched fists - almost sobbing with frustration. No matter that it was about people dying at a football match. All right, she was p*ssed but it wasn't the football that bothered her, it was the fans.
Just one example and there'll be many others on many other themes from lots of different clubs. Something broken there and it's not just football.