You can, but if the exact quote in the GP is correct the claim is claiming the software is "gay, trans and anti-colonialist" and asks you not to use it. Why use a license that is designed to be politically neutral and then ask some people not to use it?
What I can see is a fairly clear indication that they do not want contributions from people whose politics differ from theirs. I would also question whether government funding of a project with political policies about who can participate is appropriate. The political stance is also rooted in a particular culture so is unwelcoming to people from other cultures.
Of course people can political views and preferences, but they presumably have some aim in mind when making that statement in the README. What is that aim?
A license designed to be politically neutral?
The GPL variants are the antithesis of politically neutral.
> What I can see is a fairly clear indication that they do not want contributions from people whose politics differ from theirs
This is the same FSF that in the past has refused contributions from people whose politics include "I would like this software to run on my windows/apple/other proprietary platform". They're extremely political.
You can always ask anyone not to use anything. Doesn't mean they have to listen, but you can still ask.
Because signalling has replaced real virtue.
The aim is to reduce the number of users of the software who are uncomfortable with those who are gay, trans, and/or anticolonial, probably because dealing with such people is a heavier burden than the other kind.
>Why use a license that is designed to be politically neutral and then ask some people not to use it?
Because you can have preferences while not restricting legal rights.