They don't have to be objective to be useful though.
The flat earthers don't fall off the planet just because they think the world is flat and believing it flat still allow them to find the way from village A to B if close enough.
It's just not a good enough model to build ex. a GPS satellites.
So I agree that we will, of course, assume a lot of things are "objective" even though they aren't from a philosophical point of view and that's all good. Philosophically though you can't really get around the postmodern philosophy if you want to discuss reality to it's full extent we can.
The flat earthers don't fall off the planet just because they think the world is flat and believing it flat still allow them to find the way from village A to B if close enough.
It's just not a good enough model to build ex. a GPS satellites.
So I agree that we will, of course, assume a lot of things are "objective" even though they aren't from a philosophical point of view and that's all good. Philosophically though you can't really get around the postmodern philosophy if you want to discuss reality to it's full extent we can.