Why does my straight guy talk every single day about transgender people?

I think it's really weird and now I am wondering why is he so fascinated by them. He is a much older man, and acts much younger. I had to literally raise my voice to tell him to stop talking about them everyday.
What do you think is up with his behavior?
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When I asked him why he's so into this transgender talk lately, he answered by saying it happened after I showed him that emoji of the pregnant man. What would that do to make him start acting so different?
Why does my straight guy talk every single day about transgender people?
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