Why do some people talk in this manner?

I have known a few people that seem to have no censor at all in their brain or mouth. They don’t necessarily say offensive things about other people, but they put all of their business out to anyone who is listening. For example, a co worker I know, after knowing him for about a month or 2, tells me out of the blue that he used to have chlamydia and herpes while already telling me about his promiscuous past. He tells me and other people that he fantasizes about raping his ex-wife, just really strange private stuff that you would expect a person would want to keep secret no matter what. He told me that he feels the rich should stay rich and the poor should stay poor, just very shocking things, and he’s not joking at all, he’s already made that clear.

The list goes on, and I just perplexed why someone would say such incriminating and embarassing things about themselves so non chalantly. Have you ever know anyone like this? I repeatedly tell him that he shouldn’t tell everyone so much stuff about him. It’s like he wants someone to confront him intentionally or something.