come on dun be a wussy in front of a girl, if she tell u to get a life, tell her stop trying to attract my attention, I wun fall in love with you. her face will blush and say crap like no, then u just said now you ruin my opinion of you quickly get away before I kick your [edited].
STOP BRINGNING UP OLD TOPIC YOU darn NooB!!!!!!
There is nothing, absolutely NOTHING wrong with bringing up an old topic if you have something, no matter how small, to add. in fact it's better than to post it in a new thread.
Bringing up an old topic with a smilie, or "lol" is not alright. Saying "agreed" is not recommended but at least it's saying that you support the previous post, which backs it up and makes the previous post stronger.
Anyway, to answer the question. To be fair, I think we can all agree that magicians do in fact not have lives. They practise their tricks alone in their bedrooms, cutting themselves off from the rest of the world. Okay that may not be totally true, but you get the point.
I imagine that people will tell you to get a life because you've just got one up on them by fooling them, so they feel the need to get you back. Therefore there's nothing wrong with them saying that.
Don't try and get into an argument with them because a) That's childish, and b) it'll halt proceedings. I think you should just try and end the conversation as quickly as possible. The best thing is to make a joke out of it. I'd most likely just say, "Ouch!" in a faux-offended way, which acknowledges the fact that they got you back without you getting stressed about it.
Or you could take the route of admitting that you have no life but in a semi-sarcastic way. Or you could say you lost it in a magic accident or something. I'm just naming stuff off the top of my head here, which I think is the best way to deal with this sort of thing - off the cuff, random responses.
"Yes, do you want it?"
"No, I must have misplaced it."
"No, but I have a knife
"Well you see, that's the thing. I have qualities of both magicians and normal people. i don't have a social life but at least I'm cr*p at magic." (If you really want to poke fun at yourself)
That's a bunch of random things I made up on the spot. Since they're ad-libs I can't guarantee they'd be any good, but usually if no-one's really thinkng about what you say they don't have to be perfect. Whatever you say, though, it shouldn't sound scripted. For some reason reciting out and one liners in a scripted manner just sounds wrong to me.
Wow, that was a long post!