Hundreds of thousands of tweets have been sent with the hashtag #HeterosexualPrideDay.
The idea has outraged many who have flooded the hashtag with gay pride memes and other mentions of support.
The Twitter user who started it all has declined to comment.
Ah yes, #HeterosexualPrideDay, for all the individuals around the world who are systemically oppressed for their heterosexuality— Jose A. DelReal (@jdelreal) June 29, 2016
It's #HeterosexualPrideDay, a day when straight people finally can come out with fear of losing their jobs, friends and family.— George Takei (@GeorgeTakei) June 29, 2016
Hetero sexual pride day is here. Needing to share your heterosexual pride usually means you?ll be sharing your gay pride in about a year.— Chelsea Handler (@chelseahandler) June 29, 2016