How do I show someone I hate them?

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There's this bitch, let's call her Red. She's generally a manipulative person, and no one in our nerd group likes her. She blocked a friend of mine on facebook for opposite political beliefs. Red later publicly accuses him of harassment. He's a good friend of mine, so I try to defend him politely. I say if you don't want something criticized don't put anything at all. She flips her shit. Tells me I have my head up his ass, tells me she has a job and a life, and the conversation is over. She ends up unfriending me. And stops hanging out with everyone else in our group of friends.

A few peaceful months pass and my friend wants Red to come back to hang out with our nerd group. She says if he apologizes, she'll consider coming back (through her boyfriend, I might add). If she comes back, which I'm hoping she doesn't (I'm a shy piece of shit who likes being nice to people. Even though I might not act that way when I see her), but I'm wondering if there are any ways I could convince my friend not to apologize, or to just show her in the most passive aggressive way that I hate her?