Why would you say that, because it was a leftie who came up with it?

"The paradox of tolerance states that if a society's practice of tolerance is inclusive of the intolerant, intolerance will ultimately dominate, eliminating the tolerant and the practice of tolerance with them."

This totally applies to the supposed "all are welcome" of LGBT, because clearly, people who don't agree with LGBT aren't welcome. In the same way, it also explains why many Christians are wary of LGBT people because they tend to be explicitly anti-Christian, and those churches who do admit them often end up being completely overtaken by LGBT worship.

My point being, any group claiming to be more tolerant than anyone else is ultimately lying. Tolerance is always a matter of likeness and cohesion. Those who don't fit the norms will always be excluded.