Sriram, supporters of the liberalisation of attitudes to homosexual practice have always used hyperpole in order to make their view appear to be more moderate and therefore acceptable than that of those who disagree with them.
This makes homosexuality seem like some sort of cause - and it needn't be. All that is required is to accept that the private sex lives of consenting adults is exactly that: private, and that the sexuality of these consenting adults is entirely their own affair.
Ironically, the suggestions for why people disagree are often so far from reality as to make one wonder what they really think behind the facade of liberalisation-speak.
It seems to me that prejudice is very real indeed, as is discrimination that flows from it, and that some are concerned about this is not, as you suggest, 'the facade of liberisation-speak' but is an expression of their concern - a concern that you seem eager to trivialise.
As regards the sexuality of consenting adults - what bit of 'private' do you think is problematic?