I hate the Leafs, and I'm not all that fond of some of their fans, particularly the ones that invade the Vancouver arena like locusts whenever the Leafs are in town, but I take issue with that comment.
Most people are born into the fandom of their team because their team draws its fans from the geographical location they were born in. Their team is like an older brother or a sister to them. They've been with you all of your life. You are not going to abandon them when they go through a rough patch, even if they appear to be making dumb decisions. You will continue to support them, just like Leafs fans do with their team.
I've seen comments like yours before. In fact I've seen them about fans of my own team, the Canucks. It's just a way to demean a rival team's fans at a time when they're feeling down and their team is stuck in the swamp. Those times don't last forever, and seemingly suggesting that fans should be ashamed of their team and abandon it when times are hard means one doesn't understand what it means to be a true sports fan.