Why do you think April was so fast to go back to being mean to Sterling after her dad came back instead of talking it out with her (I mean they did talk it out after but damn! her animosity towards Sterling when they were at the lock-in hurt to watch ?)

I think, aside from the show going for max angst, she just got SUPER freaked about her dad and it was her first instinct, paranoia that even being seen with Sterling would confirm everything anybody was suspecting. Maybe her first reaction had even been to go to her and that would have scared her even more, especially when it seemed like her friends (”friends”) were kind of suspecting something too. She does tend to react first and then settle down, like with Luke, as she then did with Sterling, but it’s hard to shut down that first instinct.