A friend of a friend befriended me lately.
Initially, they seemed extremely intelligent and I was very impressed, looking forward to more. However, they started IM-ing me and they didn't take too long to come across as extremely odd (in a bad sense), horribly promiscuous and hateful toward the proletariat.
Despite this, they are friendly to me, sending me several IMs for every one of mine and branching off the conversation to yet another thing whenever I stop it with some uninterested reply or just plain ignore it. I'm finding them tiresome, distressing and inane, so what can I do to remove them from my life in the most harmless way possible?