I wasn't always a software engineer, and in my previous career (academic linguist) there were lots of gay men. This wasn't because linguistics departments were making a concerted effort to hire gay men. Nor are linguistics departments in the USA particularly diverse in other respects (e.g. race). In general, it's a mistake to conclude that any 'diverse' people you see around must have been hired according to some special diversity criterion. There are probably lots of contributing factors – tumblr's large LGBTQ user base being an obvious candidate.

It's not super helpful to LGBTQ folks to spread unfounded rumors that large numbers of us are just in our jobs because we're LGBTQ. Unless you've got some really strong evidence, I'd have to say that your remarks on that point were somewhat misjudged. I understand that you mostly wanted to tell a colorful story, but at the same time, it's annoying to see these ideas spread, even in a somewhat flippant context.