The Christian viewpoint is the least tolerated, especially if we say that there is a God, there is only one God (Isaiah 45.6), Jesus is the only way to God (John 14.6, Acts 4.12) and that homosexuality is not only unnatural, but a sinful lifestyle (1 Cor. 6.9-12, 1 Timothy 1.8-11, Rom. 1.23-27).
A Christian college student called Greg Koukl of Stand to Reason on his radio show and asked his advice on how to deal with a class assignment regarding LGBT lifestyles, and how she could stand up for her faith. (The original broadcast mp3 is here, about 23 minutes, ten seconds into the show.) She called back with a follow-up report and discussion. They noticed how people who want to be "tolerant" were being intolerant themselves, and disrespectful of the beliefs of others. That follow-up call is excerpted below, or you can listen to the original broadcast mp3, at about 2 hrs, 27 minutes, 38 seconds into that broadcast, here.