If you truly don't believe that progessives won the culture war, try being slightly to the right of Bill Maher anywhere on campus, in entertainment, in media, in your workplace or on twitter...
Ok so right wingers get occasionally harassed in some left wing areas. That is a response to the fact that right wingers have continually made progress while the left has gotten nothing really concrete(again: row vs wade: lost, lgbtq rights: in danger, gun reform: nonexistent).
Culture drives law long term and so its difficult to admit that the culture war has been won by the left if they keep losing everything except the conversation which clearly does not matter in the long term if it results in no meaningful change.