Green’s Dictionary of Slang

dishy adj.2

[dish v. (3)]

(US gay) verbally cruel, negative.

[US]B. Rodgers Queens’ Vernacular 65: dishy [...] critical, and verbally able to express it.
[UK]Burbridge & Walters Breaking the Silence 16: Never had I seen so many gay men and all so dishy.
[US]R. Stevenson Third Man Out 3: [H]is dishier gay enemies predicted it was only a matter of years, or months, before Rutke began to exhibit physical defects numbers two and three—bad skin and obesity [Simes:DLSS].
[US](con. 1962) J. Ellroy Enchanters 51: Where’s all the dishy phone chats with Hollywood insiders.