If somebody legitimately has something in deep, it's perfectly ok to tap. When there's no way out, it's fine. People question someone tapping to artery chokes, but I say to that, do you wanna be the guy that shit himself on tv because he got choked out cold? It does happen. Also, there's no honor in letting someone break one of your limbs. That's stupid.
I'm assuming you're defending Conor. The issue isn't that he tapped, the issue for me personally is that he didn't make any effort to get out. It was a legitimate submission, but as soon as Khabib gets ahold of him you can see his hand just hovering...waiting to tap. He went out with a wimper after all that shit talking he did, and THAT'S what makes it funny.