TL;DR: Interstellar hydrogen clouds could act like a naturally occurring galactic maser (a mechanism to amplify microwaves like a laser amplifies light), emitting a beam of intense microwave radiation when zapped by a flare from a passing magnetar (a neutron star with a very strong magnetic field).
They are an advocacy group, they go where their audience is. Of you are looking for white dudes what's the point of looking for them in the fediverse, where 98% of them already agree with you?
Ahahah, but no, she doesn't like it.