Tolerance is not a bad thing. Supposed tolerance that turns out to be actual intolerance is a bad thing. The vast majority of "tolerant" lefties are actually highly intolerant of anything other than their perspective.
I know what you're saying. I get it. The problem with being open-minded is that you have to be ok with closed-minded stuff. Right? Otherwise, you aren't very open-minded. It's like, I don't believe in hate, only love. Therefore, I should love those who hate. Since to love means "to support", to truly love we must support those who hate others. Let's aid them in everything they endeavor... including genocide.
We can play this notion of relativistic morality all day long... and still get nowhere because it all comes back to morality not being objective (no matter how much one protests it). The real difference between "tolerant liberal" and "intolerant conservative" (if that is the converse), isn't WHAT they think is tolerable... it's that with liberals, what is
in-tolerable are exception and with conservatives, the rule. Conservatives go around trying to find others to be intolerant of, who have no impact whatsoever on their own lives. Liberals are intolerant of those intolerant people because they can't mind their own damn business.
It's like not believing in killing. Some people will make an exception if a killer insists on taking the life of an innocent. I can't say I know anyone who wouldn't kill to save a child from a killer (IF it was an absolute known fact that it was the only way to prevent the death of that child). Yet, I know many who are against killing. So, if comparing the killer of a child to one who would kill to protect the child makes them the same in YOUR mind, then I can see the confusion about thinking liberals are just intolerant of other things.