Here's a thought. Carrie Symonds is a victim of John Warbuoys the taxi cab rapist, she got in to his cab, drank vodka and only remembers feeling woosey. She does not know whether or not she was raped. This is a horrendous thing for a woman to have to handle. Could it be that she has nightmares or flashbacks. Boris might have been up late rehearsing his speech and she may have gone to bed or dozed off on the sofa, he may have gone to bed or gone to wake her from the sofa and disturbed her mid nightmare, hence the screaming 'get off me', 'get out of my flat', then picking up his lap top to throw at him, him responding 'get off my f'ing laptop' as it contains his speech amendments. He calms her as she realises it was another horrid nightmare. Police arrive and they concoct the red wine story to protect her privacy or the red wine was indeed spilled in the fracas and they use it to protect her from further scrutiny over the Warbuoys terror.
I have no more idea than anyone else what happened so my point is that there are endless possibilities and therefore we cannot and should not judge.