When used as a positive at gay or race issues. Any one who uses the word is basically saying "am ok with your view but I don't agree with it". Tolerance is not acceptance. Tolerance is not embracive.
Tolerance is allowing someone to believe what they want as long as it does not affect you. More like leaving them to their belief even though you don't agree. So, why do people love the word so much?
When people are fighting to be accepted, no one wants to be tolerated like a bug bear you can't get ride off.