Lip's Mistreatment of Fiona

Hi! First time in this place to make a post. I really think Lip is nasty to Fiona for a lot of what happens, with the exception of the coke incident (that was warranted because she was legally the guardian and Liam could've died). Everything after and somewhat before that happened though felt like Lip hated her and didn't care to support any decision she made. It's just frustrating to see as the eldest sister myself how all the kids treat her but especially Lip because he's the second oldest and should know better. Fiona was forced to care for them and she did her best and the kids definitely took advantage of that.