Maybe you're just running into an unfortunate number of people that don't understand that tanks have a very short list of defensive cooldowns/abilities available in low level dungeons. Are you using Inner Beast, Thrill of Battle, Bloodbath and Foresight when you have them available? Have you cross-classed Convalescence? If you're doing all of these things, then just shrug and chalk it up to someone being clueless. If you aren't, that's probably why you're being called lazy. If you run into a healer that's too busy dps'ing to heal (or worse yet, is just standing there as if they were afk), by all means vote kick and replace them. The healer's primary role is to keep the party healthy. If they aren't doing that, there's probably someone else that would be happy to JIP and take their place.