What does it mean if a japanese person call me "kisama" and i don't even know him?

Question:

I've had a long conversation with a japanese guy. I gave him my 2 email adresses and them he replied in another message. In the other message (it had REALLY hard kanji, even "arigatou" was in kanji, so it took me a while to figure it out), When i understood the message, he was saying thanks for the fact i was giving him personal information. And then he gave me his 2 emails. But one thing i noticed was that he called me "kisama" sometimes. From what i've learned kisama is a rude way for calling people.

What do you think?

Answer:

Yeah. It's rude. I don't know why he used it. It's weird.

Maybe, he thought you would not understand it.