The Doctor may not be scared of Thanos, but that doesn't mean he's lacking in terms of self-preservation. In a flash, he's stepping back, out of reach and back towards the door. But he's not done talking yet, he's never quite done talking.

"Do you always respond to criticism this way?" He asks, doing his best to keep out of reach. He likes the face he has now and he'd really rather not regenerate if at all possible. Luckily, or maybe he'd planned it this way, he was never very far from the door where he was leaning so quick step out and a whir from his sonic screwdriver hopefully slides the door to the car closed, another whir And... well, he's really hoping it's locked now.