But that is what we are discussing! Discrimination is not always illegal. The basic concept is generally true, but not always. The real target, ultimately, is the intolerance itself, which can manifest in all manner of ways that would be difficult to end without destroying freedom.
Discrimination based on immutable characteristics is illegal.
I’m assuming many people believe said characteristic is not necessarily immutable.
Well that’s just too bad for those people then isn’t it? Not all beliefs are deserving of respect.