We're talking about having a superset term in common, not implied endorsement

I don't buy it. This issue isn't about semantics, it's about status. You evidently disapprove of the status being granted by the academic/critical elite to certain poets relative to Lady Gaga. But as far as I can tell you haven't confronted their reasons for preferring "high poetry" to Gaga, instead simply taking it for granted that their reasons are inadequate.

The way to argue your case is to give an example of a poem that the establishment thinks is good and that you think is bad, explain why you think it's bad, and explain why their argument that it's good is wrong.