What we're talking about is your assertion that AK was asked during her many interviews with the police about the details of her own activities on the night of Nov 1. You've also asserted that she may have been drinking, that she didn't want to talk about having sex, and that she didn't want to talk about smoking pot. I agree that she'd prefer not to discuss pot, given that it's illegal. No idea why you think she would try to hide that she and RS had sex, given that she told them she'd spent the night there. Alcohol seems to be your own invention.
I quoted from Preston's description of his Mignini interrogation because it matches so closely the way AK described the shift in how the police treated her and the changing nature of the questions they asked her on the night of Nov 5 as compared to the days just before. Polite and interested one minute, threatening and accusatory the next.
I don't know what RS meant by "pack of lies." My guess is that it was sarcasm, the kind a teenager would use when an authority figure had utterly failed to push him into saying what the authority figure wanted to hear. "Okay, you're right, have it your way, everything I just said is BS, happy now?" That sort of thing.
Again, it never dawned on him that they were seriously thinking of him as a murder suspect. He was just a privileged guy showing his annoyance at having to deal with people he thought had no right to talk to him.