When platforms were more open (ahem, Twitter), there used to be a bot you could mention in the replies of offending posts that would post a recording demonstrating how bad/inaccessible the experience was with the offending content in screen readers. Used it a few times to demonstrate on some big tweets, good eye opener for ppl abusing math symbols. iirc one was to demonstrate when Wordle exploded and everyone was posting those little green and yellow emoji squares. Granted, that was not an easy one to solve and never really was as the best option, using an image of the results, was not easily do-able in the pipeline from game -> sharing to social.

What really irks me is social media managers/content professionals posting that way on corporate accounts, sports team accounts etc, when they should know better, or bein accessible/inclusive should be on their radar more as it's been a topic of note for a number of years with the rise of ALT text considerations etc. Shows their inexperience.