There was no reason to voice any opinion tonight. It's just a song!
Clearly the majority of people feel differently. I always used to hear a few scattered complaints about "you suck" but tonight was most of the crowd reacting to something they disagreed with. We were all paying customers, we have the right to voice an opinion. If it's "just a song", then why do you seem so STRONGLY against it? Try to see another point of view sometime. It's an interesting concept.