I dont get the hate for Tarly.
Did you see what Cersei Did? She wiped out an entire house!!
Tarly even tells Jaime that he saw what Cersei does to those who disobey her.
If he goes against her, he knows that she can label him a traitor against the realm and wipe out his house.
He made a decision to back Cersei reluctantly.
Jesus, I feel like people just watch this show and post on neogaf and miss every dialogue. They pretty much spelled this out.
Like it or not, Cersei is the protector of the realm. Her commands outweighs allegiance to any house.
I'm sure someone can better explain to you why its bad, but it's weird to me because: House Tarly was loyal to the Targaryens during Robert's Rebellion, so you would think they'd be supportive to Dany. Secondly, they were loyal to the Tyrells as well who are now supporting Dany's claim. And even then, it doesn't make sense to be okay with what Cersei did or trust her afterwards.