"Libre software" and FLOSS immediately sound politicized to my ear.

As in, such projects carry baggage, in the form of conflict and infighting among developers, and one can expect irritating pedantry when discussing use and preferences.

Usually, you'll encounter something akin to fanatical fans, expressing highly opinionated views about minor details. Sometimes it's because lawyers have been involved. It's not necessarily toxic, but often reflects splintered cellular activity, among groups seeking to distinguish themselves from one another for some reason.