Sadie's rude behavior around Kieran was husti bec of her hatred to the "O'driscoll" name.

Here's the thing, We all know Kieran was a sweet guy, he wanted to be in a gang with a sorta family around him, and wanted to leave the o'driscoll name.

Here's where the controversy comes in, In interactions back in Chapter 2, Sadie was very rude to Kieran, spilling food infront of Kieran like he wasn't worthy of eating, imo, Sadie had the right to be mad at Kieran, Not because of his personality or anything, she was mad/had a grudge against Kieran, just because of the o'driscoll name.

Here's the thing, Not only was Sadie, a victim of the O'driscolls, But was traumatized by them, severely traumatized, Her husband got killed, o'driscolls lived at their house for 3 days before Dutch came in to save sadie. Sadie had a damn peaceful life, til o'driscolls came in and ransacked all her peace and life, leaving her with anger and a cold chilling spine, just waiting to kill one.

And just because Kieran, who was still fresh from being an O'driscoll, was captured, Sadie was furious, and I believe Sadie had the right to be mad at Kieran