Marcellas, they can't really explain why, but since you've asked a hundred times, I can. You stuck out. If you put a bunch of insecure, paranoid, generally uninteresting dimwits in a room together, they don't know how to bond. They feel isolated and lonely and nervous, and they're at something of a loss, because getting to know each other takes time they don't have. Therefore, they look to the most obvious way that idiots know to bond with each other and remind themselves how cool they are, which is to choose someone they can all agree to pick on. And the person who's going to get picked on is the first person who sticks out. Sometimes, that leads to a not-bad choice, because the loud, obnoxious crapweasel gets targeted. Sometimes, it's a total and complete rip-off, because someone with absolutely nothing to justify disliking him or her gets targeted. But usually, as it was with you, it's a combination of good and bad reasons -- someone is targeted because he has a quality or two that make people vaguely uncomfortable in a way they don't even consciously recognize (this is the part of Gerry's weird "I have a dream" speech that was true), and because he's a little socially clumsy, and because he's a little irritating. Not any more irritating than the rest of the morons, of course, but once the momentum goes against you, a social closed system like this is hard to counter.
Chiara, of course, can't exactly explain that she was part of a toxic dump of groupthink, so she goes to yell at Josh for being mean to Marcellas. But not before she tells Lisa and Marcellas that it's people like Josh who make everyone feel like they have to worry about being stabbed in the back. Lisa looks like she's about to take Chiara's halter top and pull it up over her head. And twist. Kiki goes huffing out into the yard, where she unloads on Josh the weakest, lamest, most unconvincing rant in the history of ranting. She doesn't even sound remotely offended, let alone angry. She just sounds...like she just had to send her steak back to the kitchen or something. If Danielle's yelling at Lori was "ghetto fabulous," this is sort of "gentrified watery." This really is the worst rant ever. She cannot rant. "Sometimes, just sometimes, take someone's feelings into account," she tries to snot at Josh. She can't even snot properly. Of course, on that last one, she's probably afraid to say it too loud, lest she be struck down by lightning where she stands. Josh goes and gives the predictable poor-quality apology, still insisting that all he did was tell the truth. I hate this kind of apology so very, very much. "I'm sorry I was hurtful, but I was still right." Bite me, Josh, and get the hell out of the house. Oh, you already did? Good.