Not exactly what you were implying I think

https://imgur.com/UONQHpN

Not very diverse or inclusive.

It has "Men" right in the query, no?

I changed "men" to "workers" and it gave me three white men, all with shaved heads, who looked like clones of one another.

"Please generate a photorealistic real-world image of london bin men emptying wheelie bins into a bin lorry" gives me this: https://imgur.com/jFaYq1v

It's a shitty image, but only because the details and style are wrong, not because of any DEI stuff.

Removing "photorealistic" might improve the prompt. Photorealism is another art style. Try including "Photo" instead with a specific camera type, lighting (3 point lighting, 35mm, 80mm, etc.

it's always white dudes, mostly with beards. Even changed "garbage men" to "sanitation workers". Then prompted it to be more diverse and it put two black guys, one with a beard. One of the white guys appears to have either a fishnet or sequin shirt so presumably he's gay.