That's not entirely fair. Should Threadless not have t-shirts for women because they all have graphics on the front? I think imagery on shirts has enough nuance that saying it is inherently sexualizing is as much speaking for women as you are claiming he is.

One can both agree that unisex t-shirts aren't good enough while still calling out taking the discussion to an absurd extreme. You don't have to agree with that call out, but just saying NO is hardly useful here.