If you say a Grado is harsh and ear bleeding highs, then no I dont believe you have heard one as this is totally the opposite of how a Grado sounds.
Even worn out bottom of the range black is not thin and harsh.
I can believe someone especially the older ones finds Grado too rolled off or too lush and sweet ( some like this some dont) but no Grado has every been described as thin harsh or ear bleeding so no I dont think you have heard one.
A 2m red is harsh, a Grado is not, thry are anything but.
Chris