As others have suggested, you want to be the guy doing this. When everyone's calling you an "idiot" and "moron", you know you're on the right track.
The reason for this will become obvious to you if you study the posts in this forum, especially those discussing "ICM" or Independent Chip Model. A really good recent example of a "maniac" pushing a lot can be found
here. This is an example where, paradoxically, folding AQ against a guy you know is pushing just about any two is correct. If calling with AQo is a mistake, than pushing hard all the time as the big stack in these situations must be correct. It's all about chip position and the size of the blinds and far less about the cards you hold at this stage.
Once the blinds are 400/200 and up, it's not too far from being correct to raise everytime it's folded to you. The blinds are just too large as a % of everyone's stack and there are too many players, like you, who are afraid to gamble with hands like K7o. This makes the play that much more profitable.
The net effect of this, at least for me as I was once too tight to make these plays and calls against the aggressors, is more busts in 4th, but far more 1st place finishes. You either bust that guy who finally calls with AJ when your live 85o pairs (this is where you'll get called "idiot") or gobble up tons of blinds. It's a very effective, if seemingly mindless (though really not mindless at all) way of playing. And it's lots of fun being a maniac!
As far as defending against this, yeah, you have to call with K high, sometimes Q high. But it really depends on chip position. As the example cited, calling with AQ can be incorrect, in other examples, calling with Q high is correct.