I don't see how this would be classed as an advertisement. I have no affiliation with McDonald's and at the end of the day this is a meme that will likely have no effect on their brand image given the strength of their branding already and the relatively miniscule reach of this post. I think it would be a bit overzealous to remove this on the grounds of advertising.
It's not about you as a person, but about this imagery and its (brand) symbolism.
Having any image posted here (even if funny haha, or otherwise), containing logos of Google, Amazon, Apple, Palantir, Coca Cola, etc... would be disturbing to me. I am just wondering if others think this way.
These symbols (brand logos) have been hammered in the brains of each and every inhabitants of this planet, through billions invested in spreading the most low-level messages humans have ever invented ("hmmm!" "i love!" "this is great!" and other brainwashing concepts...). I personally love my spaces to be free from brands, brand names, brand logos, and advertising.
This is closer to fair-use satire than advertising (although not that close to either). It's funny because McD is somewhat opposite to the gym, and that's not advertising for the golden arches.
I understand the alleged funniness in this, and am in favour of all sort of fair-use (and even unfair-use!) of copyrighted, patented and otherwise trademarked material...
My questioning here, is: aren't we advertising for the golden arches by multiplying them on our own federated servers? In people's brains which have been filled already with this logo from the day of birth, associating it with sugar+fat tastes that speak to the "hmmm! good" part of the brains... seeing this wouldn't trigger a "hmmm! good" reaction, you think?