Nobody is advocating for a rude communication style; the disagreement is over what constitutes rudeness.
Some people/cultures see being blunt or to the point as rude.
Others see beating around the bush, wasting time and hogging the listener's brain space with fill material that serves no purpose other than delaying the actual closure/completion of the thought (including insisting on various rituals, either verbal or, in some cases, physical, such as drinking a cup of tea (or coffee) and not broaching the actual subject until both parties have finished drinking), or perhaps (though I suspect this is less common as an actual motivation than generally supposed) taking pains to respect the imagined feeling of the listener, and possibly most importantly, to reaffirm the social hierarchy, as rude.
Some people/cultures see being blunt or to the point as rude.
Others see beating around the bush, wasting time and hogging the listener's brain space with fill material that serves no purpose other than delaying the actual closure/completion of the thought (including insisting on various rituals, either verbal or, in some cases, physical, such as drinking a cup of tea (or coffee) and not broaching the actual subject until both parties have finished drinking), or perhaps (though I suspect this is less common as an actual motivation than generally supposed) taking pains to respect the imagined feeling of the listener, and possibly most importantly, to reaffirm the social hierarchy, as rude.
It's just a difference of perspective.