Ares ignored Alicia when she was trying so hard to get his attention and dressed up really nicely. And then when he did notice her he said nothing and was acting like an idiot. He also wasn't really helping her out.
Kai was just being rude to her as always and said that she looked funny in the outfit and asking her why she didn't dress normally.
So she was just upset that they were being rude to her and ignoring her. I was mad because they didn't apologize when they knew she was upset. So yeah that's why she was mad.

I'm still so mad at Ares and Kai I wanna slap them both and tell them they are idiots. Also Dumb? Really Alicia? You couldn't think of anything else? Wow...