I had this experience a short while back, and it really shook me. Granted, this was on the Internet, where people are more willing to say wild things or generally go mask-off, but I was downright flabbergasted. I’ll try to summarize the various arguments without inserting my own bias:

• because they view human rights as a social or legal concept, and not inherently more important than other social or legal principles

• because we as humans haven’t historically respected them, and don’t respect them universally even now, so demanding respect for human rights is a form of privilege

• because the idea of human rights requires a belief that humans have special dignity above that of other creatures (this one I found especially irksome, because I found the arguments denigrating to animal rights)

• because various groups advocating for human rights don’t agree on what those rights are, so blanket support for human rights is not something they can do

I’ll try to find the reddit post where this took place if I can. It was… it was something. If I’ve misrepresented any of the arguments above, it was not intentional but only because I find them so alien that I cannot understand them properly.