An issue with a friend Options

[SimplicityGirl]

I really need some unbiased opinion here. This is why I'm turning to you guys. It's about what I perceived to be a misunderstanding between me and a friend.

Characters:
Me- obviously who
L - Guy friend that I've known for ~1.5 years.
Jn - L's good friend. Also a guy friend that I've known for ~1.5 years.
K - My boyfriend
Js - My closest friend. I've known her for close to 6 years now

The plot:
Yesterday evening, I left L a message on msn to check out this site because it got revamped. He messaged me back, saying that the site looks bad. As a joke, I said "well, your face is ugly", and he got pissed at me. We're pretty tight, so he knows me pretty well, and I've used this loose phrase a lot in front of him, directed at other people as jokes, so he knows it was a joke. But he still got mad at me, because I suppose he took it seriously. So I talked to Jn, and told him the story. I told him that I don't want to apologize, because why should I when L should know its a joke, and I don't mean it, and seeing how we're close friends, he ought to just realize that and get over it. Jn says I have no morals because no only do I not want to apologize, I won't admit I'm wrong, and I expect L to figure out how I'm feeling. Oh, and what a horrible person I am for saying what I said to L.

So I messaged K and Js, and they both agree that L was just overreacting a bit, and helped me to word an apology to L. The final product is as follows: "Hey L, sorry for what I said, i meant it as one of those casual joke things. It was meant only as a
joke, and nothing else. I didn't think you'd take it seriously, so sorry." So I pasted it over to Jn's window, to ask for his opinion. He told me to not say it if I wasn't going to mean it, and how I must suck if I needed help in writing a simple apology.

Regardless of Jn's opinion, I pasted the apology in L's window, and then he said that he really isn't mad at me, and that it's "fun" to make me apologize because then it puts him in power and control for once. Power and control for what I don't know. So I thought everything was fine.

Just now, L messaged me and we talked. And this time, he's saying how he wants me to admit I'm wrong, and one thing led to another, and I said how I don't want to apologize to him in the first place, and that I finally did, he's not taking it. He said don't apologize if you don't want to. And then I asked him what he wants me to do, and he said nothing, absolutely nothing, in a sarcasm dripping way. Oh yes, he's also taking the opportunity to call me stupid, and all that, because I made a sharp comment to him last night. Oh and he told me to be a bitch if that's what I want to do.

My dilemma?
I don't know what to do really. I don't know why L's still bitter when he was okay when I said sorry. And especially since he knows it was meant as a joke, not as something serious. Yes I do realize its a rather harsh thing to say, if I meant it, but I didn't, and it's a joke, and he bloody well know it's one. Yet, he's making a huge fuss. So I just need you guys' opinions on this issue.

Thanks.