The reality is some people will always moan - the management did to get over it and focus elsewhere. The moaners
aren't going to change, everyone knows that.
Whatever the players do on the pitch it is never going to be enough for some, if people feel this strongly about the moaners, then the next time they start, drown them - sorry I meant drown them out with positive comments or singing.
If they are totally abusive then report them and have them kicked out......