I agree that attending a social dance would not advance a competitive dancer's competitive dancing, but that wouldn't make attending a social dance serve no purpose, unless competiton was their only interest in dancing. Their loss, if so.

And really, you can't expect to get away, unchallenged, with the implication that only competitors would know better that to fail to dance up to and into each corner before continuing on the new LOD, and that it is only the "untrained" (social?) dancers who would commit such a basic fault. What twaddle. There are bad dancers on most dance floors, social and competitive, and social dancers are not your inferiors.

From what I've observed many competitive dancers actually couldn't get round a crowded social floor: the men don't have the floorcraft and their leading skills are not up to the job.