“The so-called paradox of freedom is the argument that freedom in the sense of absence of any constraining control must lead to very great restraint, since it makes the bully free to enslave the meek. The idea is, in a slightly different form, and with very different tendency, clearly expressed in Plato.

Less well known is the paradox of tolerance: Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them.
There is genuine proof throughout all of human history that if we are tolerant of intollerant views life gets worse for a lot of people very quickly.

Anyone trying to justify this by people shouldn't be offended is either too stupid to understand the point or deliberately trying to give intollerent people a safe space to air their views.

Certain differing opinions deserve to be shouted down, if your opinions keep getting shouted down maybe you're not an outspoken genius, you're just a twat.