Yeah, I saw the tweet… Well, David has always been warmer with fans, he puts his hands everywhere (not everywhere everywhere), he asks genuine questions about you even if he forgets the answer in a heartbeat it makes you feel comfortable and he signs everything you have in your hands no matter what it is. Gillian is different, but she has proved more than once that she too can be warm and welcoming with fans. Let’s give her the benefit of the doubt. Maybe she was trying to concentrate, or it was cold, or she just wasn’t in the mood. 

 I think she’s also different when she’s around David, so hopefully, the experience of meeting her on set with him nearby will be more satisfying for people there. 

Also, with the secrecy around season 11, and she not leaving her tent without umbrellas, I think Fox might have asked her not to show herself or interact as long as possible.