Weird is such a strong word.. how about people like this just require a bit more understanding?

SO I am in class about to take a test. There's this girl. I don't really know who she is. She sits near me and another girl I know sometimes. She has random spurts of spite towards random bystanders. For instance, in this particular situation she turned around to say something about a girl in the room that was wearing too much foundation.
Spite Spurter: Wow is it just me or does that girl have the complexion of an oompa loompa?
Me:.... (thinking to myself, wow, I didn't realize there were people who actually cared enough about what strangers wore to school to note a rude statement about it to other random strangers)

But then.. one of those once in a lifetime chances knocked at my door in that moment. Perfect joke opportunities are like gems floating in the air. You just have to reach out, grab them, and admire them.

There was a girl sitting right in front of oompa loompa wearing a highlighter colored orange winter jacket. I couldn't help it.

Me: I think that's just a jacket.
Girl next to me laughs.
Spite Spurter (in all seriousness): No. I wasn't talking about her
Me (confused): Thinking... wooooaaa hoaaaaaaa sister let's settle here

Then after this exchange, said girl gathered her things and moved to the farthest possible seat in the lecture hall.
Me to girl next to me: Do you think she moved because of what I said?
Girl next to me: Does it matter? The point is that she left.

After class, I of course had to go confront her. I said to her "Hey I hope I didn't piss you off with what I said. You know I was just joking around, right?"
And thinking she would react like any normal person when being trapped in a situation where they are being called out on overreacting and/or becoming irate over something trivial, I was actually surprised when she responded "Yeah. When you said that I was just like fine I'll just sit over HERE now." (With a definite vocal emphasis on the HERE).

Usually when you're caught in the act of overreacting you say something like "Oh NO. That wasn't even what I was mad at" all the while thinking "That is soooooo what I was mad at." She totally just admitted to her moment of craziness, and not only that, was defending it. I then told her "Ya didn't have to move" in the same voice I would use if a mere acquaintance got me a birthday gift- the "You shouldn't have" voice. Even though you and I both know a gift is a gift. And you're secretly glad they did it.

Then I walked away baffled that I manage to find these sorts of people. Then I was grateful because they make great stories. And hey I only have to deal with them for what, 15 minutes? They have to deal with themselves their whole life.