Everyone I know in KDE-land (granted quite a few have moved onto other things now) was always welcoming and inclusive.
And despite Miguel de Icaza (Gnome) being an absolute douche, Ive never known him to be problematic in a right-wing way either.
But thats just what I know, and I don't know everything. But I think youre OK with KDE and Arch.
Sure, here's a quote of a comment I made on the other post: