I think it's unfair to make such sweeping statements about "white men seething" over those movements as though this were true of all white men. For all the white men who were seething over these movements as you say, there were plenty of white men who actively supported the civil rights, women's rights and gay rights movements.

A look at what actually happened in the past will show that the legislatures and courts that ended up passing, changing or striking down laws and policies to be less discriminatory to racial minorities, women and gay and lesbians were predominantly, indeed almost entirely, made up of men - and mostly white men at that.

Moreover, some white men were actively involved in the civil rights movement of the 1960s. IIRC, a few were brutally murdered as a result.

The gay rights movements of the 70s, 80s and 90s was predominantly a movement of led and populated by white men.