This Ad Targets People Still Using "Gay" As An Expletive In
Think Before You Speak (campaign) - Wikipedia
We frame sexual orientation as discrete homosexual and heterosexual identities, an occurrence that has only been since industrialization. Politics, politics, politically correct, never would have heard of this crap in our parents day, so get a grip your all so GAY, Yea.
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This way of framing sexual orientation aligns with our psychological tendency to set up discrete categories to simplify information processing, as opposed to continuums.
They are actually saying something like Oh my god, look at him, what is he doing wearing that shirt?? Children need to be told what is wrong.