He can never take a joke. When a contestant makes a non serious remark, he pokes his nose up in the air, purses his lips, rolls his eyes then comes back with a catty remark. Whereas when someone does that to Craig on Strictly, he rolls his eyes in a way to play along with the joke and then laughs about it. Craig is a good sport, Jason is a bad one. He takes everything personally and can't take a joke and then gets personal in response but in a more serious way.
And all that is before he's even commented on the performance. Again, Craig is the more "scary" judge but he gives relevant critique and keeps it about the performance without the need for getting personal which is so much more professional. Jason doesn't give helpful critique, just nasty remarks and then gets personal about the actual celeb in question which to me is totally unprofessional and unnecessary.
And to act like him and Karen do is ridiculous for a pair of grown adults appearing on a tv programme. They are both as embarrassing as each other. Granted, some of the times I don't blame her considering the way he acts to her. But when you're appearing on a live tv programme you have to be professional. Have a word with him after if need be, cause otherwise she ends up looking just as bad.
The time he said her opinion didn't matter, otherwise she would still be on the panel made him look like a total baby and on that occasion I would expect her to have defended herself like she did. But I think she's seen how well that went down and now she tries to do that at every opportunity and it just gets a bit much