It's simpler than that. Traditionally gay couples are two working adults with no kids, or DINKs. They have more money to spend than families with kids. It's a no-brainer to appeal to that market. Making a t-shirt for straights costs as much as making one pandering to gays so why not do it one month a year. But the shift now of pandering to younger, broker, gender special millennials is a mistake.
The gays want one thing, the angry straights want another. The truth lies in the middle. I worked at Target when they made a big deal about not "gender coding" toys cause boys can play with Barbies and girls can play with GI Joe. We got a lot of angry phone calls about it from concerned parents lamenting the gay agenda. The truth of the matter was the backing paper was changed in the aisles from pink or blue to a more neutral color and we told them as such. The moral of the story is "do something minor, tell people what they want to hear, and sell them more stuff. Be neutral capitalist."
Anyway, content:
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"Move I'm Gay"
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A lot of the clothes are just terrible because of busy rainbow designs. But this is one is a classic awful design cause of the new shit they added:
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They of course pick some ugly, brown models but this guy takes the cake

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