REG is an acronym for Reactionary
Exclusionist Gatekeeper. They believe in gatekeeping of the LGBT+ community.
REGs may be:
-aphobic, arguing that asexuals and aromantics are not inherently LGBT
-biphobic, arguing that bi people must experience same-gender
attraction to be LGBT, or discounting bi experiences altogether
-transphobic, arguing that the T in "LGBT" be dropped or other such rhetoric
-transphobic, arguing that one must experience dysphoria to be trans
-transphobic, arguing against nonbinary
existence/validity
-intersexist, arguing that intersex people do not have a place in the LGBT+ community
-and many more
See also Truscum, TERF, SWERF