So getting a bit of perspective, Booing is just the simple act of showing the team that you are pissed off with them. It doesn't improve anything, it wont get players who aren't trying, to try harder, plus it sends really mixed messages to the players who give a shit.
Booing makes us sound like a bunch of entitled pricks like Villa fans were a few years back, what next, white handkerchiefs like Madrid. If you want to make a demonstration, get behind the players who clearly DO give a shit, sing their songs etc. The ones left out will get the message and can FRO in May