What does it mean to "no longer tolerate" a portion of the population?

It's the exact question Hitler asked before WWII.

Since Ultrafuct refuses to answer lets look at the definition of liberal and see if it helps:

lib·er·al

willing to respect or accept behavior or opinions different from one's own; open to new ideas.

relating to or denoting a political and social philosophy that promotes individual rights, civil liberties, democracy, and free enterprise

Oh shit, that's not right.

Lets try this:

au·thor·i·tar·i·an

Favoring or enforcing strict obedience to authority, especially that of the government, at the expense of personal freedom.

Nah.. He wont get it. Simply too stupid.