Bing also generates political propaganda (guess of what side) if you ask it to generate images with the prompt "person holding a sign that says" without any further content.
It doesn't need to be intentionally "generating propaganda". Their old diversity-by-appending-ethnicity system could easily lead to "a sign that says Black", which could then be filled in with "a sign that says Black Lives Matter", which is probably represented quite well in their training data.
As the images in your Reddit threads hilariously point out, you really shouldn’t believe everything you see on the internet, especially when it comes to AI generated content.
You should try yourself. The bing image generator is open and free. I tried the same prompts, and it is reproduceable. (Requires a few retries, though)