I didn't see it as being mean rather being cold to him. She hates Lannisters, she was forced to marry him, she's been through a lot and she's learned she needs to take care of herself. No wonder she didn't welcome him warmly with open arms. We don't even know if she knows what happened to him like trial and all after that. She may know some of that. She never loved him and then she was yet again forced to marry somone she didn't want to. Tyrion treated her well and was nice to her but he didn't do one thing to rescue her from all those monsters. And I mean taking her away from KL not the 'incident' when Tyrion helped her when she was beaten by some soldier (don't remember this exactly) on Joeffrey's commands.
And there's also one thing more why she treats him this way and possibly doesn't trust him. He chose Dany's side. And I don't think Sansa likes it. 😉 In their brief conversation, if I remeber correctly, she says soemthing about him being the hand of the queen now. I think she maybe even despise him for that.