What a stupid statement. I can't really speak for Chelsea supporters but success is relative. Booing might have been a bit excessive but they're obviously not happy with this recent form (with a full strength team today bar Lampard, it should be said) and they have every right to show that discontent.
Yes they have as much right to show discontent as everyone else but you can't honestly tell me that's the first time you've heard Chelsea fans boo their team off? They do it every time they drop points at home to someone outside the top four just about. Things could be so much worse for them.