It's a weird situation. I was definitely side-eye at the original leaked "
owes me sex" lyric because that just sounds petty and shitty for a lot of reasons. The lyric as it appeared during this performance though, changed to "I feel like we
might" feels much more believable as both a joke (in poor taste, sure, but a joke nonetheless) but also as a thematically appropriate statement of braggadocio at that point in the album.
Granted this might all be rubbish given that we STILL don't have a final version of the album, but I feel like there's a pretty solid through-line to TLoP. Ultra Light Beam tells you where he is now, but everything else feels like a story about how he got there. Father Stretch My Hands talks about his relationship with his parents. Freestyle 4 talks around his come-up ("we about to get this paper"), how he felt slept-on, references to early album lyrics (wake up) and his almost immediate perception in the media as crazy ("I've been out of my mind a long time") after his 2005 outburst on the Hurricane Katrina aid broadcast.
Famous fits into this narrative pretty well. The Taylor interruption is still probably his most infamous outburst, and the way he says the line "I feel like Taylor and I still might have sex/why, I made that bitch famous" makes me think the intended read is not "why? I made that bitch famous" but a more indignant, haughty "why, I made that bitch famous!" tone. Playing a character, essentially, or rather a character based on a past self. He's done this before. A lot, actually. Power is the best example of this: "I ain't on a power trip - who you going home with?" "I was drinking earlier, now I'm driving," the way "so exciting" is layered to sound like "suicide" - Kanye has at least a smidge of self-awareness and likes to portray himself in unflattering ways quite often. Famous is a characterization of the height of his arrogance. He trashes Taylor, he trashes groupies, he trashes people trying to bite his style, he lists a bunch of ways he spent his money, and then talks about being close to the sun and how he's "never going to die." Famous is Icarus at the peak of his ascent.
I think the following tracks support this too. High Lights and Feedback detail his lust/love for Kim. And then everything comes crashing down in FML, Real Friends, and Wolves. Suddenly after all the boasting and arrogance, Kanye is talking about lexipro, having episodes, feeling surrounded by "wolves," and all the ways his family and friends have let him down - and most importantly, all the ways he realizes he has let them down. I don't know if it's intentional, but there's something especially haunting to me in Real Friends about his distinction between "I don't know how old your son is. I couldn't tell you how old your daughter was."
Was? There are a few ways to read that, none of them good. Ultra Light Beam's of-the-moment portrait aside, TLoP is a slow and steady descent from arrogance into anxiety. Asshole outbursts about Taylor Swift fit into that.
So, tl;dr... I think as presented in this version of the album, the Taylor line makes sense. I certainly don't begrudge her for not liking it though; I mean, yeah, it's... still not a nice sentiment, regardless of whether or not it's a joke/in service of storytelling. But it's at the very least not as nasty as the early one that leaked.