False equivalency, obviously.

That being said your mindset is literally the mindset the homophobes have… Hearing the words “gay couple” means having to think about homosexuals and causes them discomfort and they want it gone. You literally just identifying as a gay man makes them think of exactly what you typed out there.

False equivalency here, gay bro. Words mean things. Your original example was a euphemism, not graphic detail. Then you equated it with graphic detail, not euphemism. Most of the time, when people say they’re “trying for a baby” (sorry, was that too graphic for you?) the meaning is more than “We’re having vaginal sex.” it’s also “We’re being intentional, have discussed it together, decided we both want it, and are excited about being parents.” Furthermore, there is a possibility that this couple has struggled to have kids for vairous reasons, and are still determined. Maybe go have more gay sex and let your orgasms calm you down, gay bro.

They aren’t saying that, though. It’s the equivalent of you saying “my boyfriend and I are going on a cruise.”

What do I even reply to this?

Me personally and genuinely, would reply with “ok.” or “cool.” and that would be it.

“I’m a gay man” might already elicit the image you paint in some people.
So not that different.

Your example was “we’re trying for a baby”, not literally your first sentence in your post.

You are also able to use the euphemism. A queer couple can say “we are trying for a baby” to refer to the process of adopting or ivf or anything like that.