Maybe in Afghanistan, but not in the US. The majority of Republicans support gay marriage. Out of those that don’t, few would find “the existence” of a gay person “offensive” even if they reject extending state sanction to gay marriage. For a long time many Americans opposed re-marriage for divorced people. That doesn’t mean they found the existence of divorced people offensive.
I don’t see the point in treating everything short of complete acceptance as equivalent to opposing someone’s “existence.” Some people in America don’t want, as a matter of government policy, immigrants like me coming to the US from Muslim countries. They’re not opposed to “my existence”—invariably they’ll leave me alone if I leave them alone.