I disagree. You can oppose a murder without murdering them. In the same way, those who oppose certain rights of others must be opposed but not persecuted, not only because they'd become a martyr- but because even though I strongly disagree their beliefs and in my opinion are clearly wrong that doesn't exactly matter to whether I can talk to them about programming over lunch.

Your right to free speech stops where my face begins.

What does this mean?

and accepting that as an opinion would mean inherently abandoning the belief that human rights are universal.

An opinion can be disgusting and abhorrent and still be an any opinion. Nazism clearly is an opinion- an abhorrent opinion that rejects human life and human rights, yet still an opinion. Just like someone can have an opinion that murdering as many people as possible is good.