Further reading: https://en.wikipedia.org/wiki/Paradox_of_tolerance
Expression of just about anything is met with fairly minimal consequence at least in much of the US, but nonetheless, there's a difference between not accepting something versus being intolerant of it.
E.g not accepting [way of living] in one's own daily life v. not tolerating it in the world around oneself. Are both of these rejections abhorrent? Probably. But the line is crossed when someone transcends a refusal of acceptance in one's personal sphere into a refusal of tolerance of such in the world around them.
(I had a specific thing in the brackets, but pulling a page from Paul's essay, I figured I'd blot it out to make it a neutral point. Fill the blank with [religion] or [suspect classification] or [politics] and it still holds.)