[nivexous]

If I send you a stolen iPod in the mail, do I forever taint your home address? Are you forced to accept it? No, of course not. You can return it to the police, throw it out, or return it to the sender. If you keep it and use it, then it becomes your problem. The same is true for Bitcoin. You can refuse any transaction output. You are not your address.

Edit: This post is being downvoted by people who don't want it to be true. Sorry folks, it is. Bitcoin is UTXO-based, and every output sent to your address is a unique piece of mail. If you don't like that, use an account-based system where it all gets mixed together.