Both of them were awful to Judi and Janae, but I honestly think Alicia was worse.
The way Alicia and Valentina treated Janae when she was leaving was just nasty. Throwing garbage on her while she was already on her way out especially bothered me. Janae was drunk and annoying, but at that point she was leaving. It was completely unnecessary.
I can at least understand some of Shelly's frustration with Judi. Judi was genuinely an awful person to live with. Even the girls who liked her would get fed up with her. She was constantly drunk, starting problems and making a mess. The season literally starts with Judi getting wasted and spitting in their pizza.
The one thing I find completely irredeemable with Shelly is messing with Stasi's contacts. That's way beyond a normal BGC prank because you're messing with someone's eyes. But I've always thought that storyline felt contrived. We're supposed to believe Shelly did that with a camera crew standing there and nobody from production stepped in?
It also felt like they needed something for Stasi to do in the finale. She conveniently gets confirmation that Shelly did it right before everyone is about to leave, beats her up and gets this big epic exit. The whole thing feels almost too perfectly set up.
Alicia throwing garbage on Janae as she was already leaving just felt cruel for the sake of being cruel.