The wolf attacks with his fang, the bull with his horn

My sisters and I just fought. Actually it started off with Bianca and Ate, but I soon joined in, because I was defending Bianca.

Bianca wanted Ate to edit the article that Ate made her do for the Plaid. But Ate refused. Why? Because Bianca's handwriting is so bad, she reasoned, which I think is so petty and stupid. It was mean of her to refuse just because of that! Of course Bianca got mad, saying that she shouldn't have forced her to do it in the first place. Ate said that she should have told her. Bancs didn't want to actually. As I said before, she was forced.
My older sister was getting more maddeningly unreasonable, and seeing as how Bianca was rather unskilled at the art of word-fighting, I took over.
I laid my weapons bare and attacked her unstable "defenses", or rather, poor reasons.

• Poor handwriting or not, it's her JOB as the Assistant Overhead of the Plaid (school paper), and the one who assigned the article, to edit it.
  
• Ate refused to acknowledge Bianca's unwillingness.
  
• She said Bianca's article was crap (which was MEAN of her. what do you call YOUR articles?). You knew she didn't write that well. If so why make Bianca do it? Ate: You're the only 6th grader I know (it's an article about a 6th grade activity). What do you call Jamie, Bianca L. and Joanne?
  

There were a lot other things in the dust. It was a furious exchange of word play and sarcasm. I think I won, but how would I say, since I didn't want to talk to Ate after she apparently could NOT get those three reasons (above) INTO HER MADDENINGLY THICK HEAD!!!!

I admit, it was also very nasty of me, even if I was acting in my hapless sister's defense. I want to apologize, but it would kill me to do so.