Going a little broader in the tech field... I know of some people in the hacking/security community who are...well, when you're new to the scene, you're warned about them. I can only think of one guy I was warned about, but he's well known. I can think of two others I was told new guys to the scene (particularly if fairly young) should be warned about, and those two are around-since-phreaking-days levels of established and well known. Being icky doesn't mean ostracism.