'Why is Sansa such a bitch to Tyrion?!? He's only trying to be nice!!!!!!!'
Sansa is kept against her will
She is married against her will
Her father-in-law killed her mother and her brother
Her husband’s nephew has abused her countless of times and he killed her father
We as the audience know that Tyrion is kind and cares for Sansa, but she doesn’t know that. And even if she did, she has every right to place some resentment on him. Why does nobody get this.