I'm thinking about how the Log Cabin Republicans (a group of LGBT, mostly gay, Republicans) had a big party at Trump's resort in Florida not too many months ago. They put out a cringy video praising Trump, trafficking in stale stereotypes like, "we love Trump because his wife has such a fabulous fashion sense."
There wasn't much else they could say, because Trump has such an abysmal record on queer rights, including gay rights.
So yeah, I agree that selling that t-shirt deserves the number one spot as absurd rainbow washing.