The line might be a little negative, but it's hardly anything that warrants some parental action. As has been said above, he is a teenager...teenagers need some form of emotional release. Be happy his is with music and not torturing little animals.
Instead of trying to put restrictions on him, how about talking to him? Making him bottle things up when he could be healthily expressing himself will only make him more negative. Maybe just ask him why he used that line. You might be surprised and happy to find he is willing to open up to you.
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Confusion will be my epitaph...
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