Do guys use sarcasm and insults as a flirty signal?

GirlFriday
Guys, give me a clue here. I've met a guy who is always joking with me and sarcastic. We actually ended up getting off at a party a few weeks back. For example, there's been a couple of times we've been out and if I don't know the words to a song he'll laugh at me for it or when I turn up he's said things like "Oh, it's you." or "sod off". Recently, I mentioned that I might have to crash with him and his brother while travelling and he said I might only see them if I was lucky before adding that if I let him know soon enough he can take time off work (!?)

Is there some thing where guys use insults and sarcasm as a seduction tool? Why?

Please enlighten me here. Is he flirting?
Do guys use sarcasm and insults as a flirty signal?
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