It's pretty simple. Conor had nothing to offer Khabib that entire fight.
If he wants a rematch, get some credible wins going to show you really are a different fighter.
His win over Cowboy proved nothing. He convinced Cowboy not to shoot on him, so it's not like he even displayed good TDD at all in that fight.
We know Conor comes out strong in the first round, and puts 100% effort into KOing his opponent. The way he won wasn't impressive or anything different from how he always wins a fight (if he wins).
Show me a fight where Conor has to fight through controversy to get a win, and use all of his skills and heart to pull through. If you can show me that, then you can convince me he's ready for a rematch. And no, that doesn't count against Diaz. Diaz has always been a gatekeeper, and nowhere near a top 5 fighter at all right now. Conor struggling against someone like Diaz and coming back to narrowly win isn't impressive. I want to see Conor fight the true monsters of the division, where he has actual risk of losing a fight.
If you keep feeding him guys who are going to stand in front of him and not fight back, then you're wasting your time. No one wants to see lambs get slaughtered other than Conor fanatics.
It's sad Conor and his fans are content with Conor being given easy matches.
If only Conor was like the T-rex...