>>508994206 (OP)He is right: it's not physically possible to be tolerant of everything. Every society must be based on some form of axioms, and liberalism is no exception.
The only difference between liberalism and other societies, though, is that while other societies attempt to find some immutable objective truths and develop from there, liberalism has no core beliefs beyond "tolerant people are good" and "intolerant people are bad". Those beliefs are incredibly tenuous, poorly defined, rely on circular logic, and are thus very easy to manipulate.
Taking this to its logical conclusion, liberalism is so popular because powerful people can just call their enemies "intolerant", then justly (in a liberal's eyes) do whatever they want to take them out. Calling someone intolerant, going by liberal logic, means that their arguments, beliefs, and entire personhood can be disregarded in favor of spreading liberalism. It's part of the reason why leftists love using buzzwords - by calling someone racist, homophobic, transphobic, or whatever retarded buzzword they've come up with in the past couple weeks, liberals (especially ruling class liberals) can justify doing literally anything to silence anybody they disagree with.