I get where you’re coming from, and it would be great if it was at all possible to reliably identify internet sarcasm, but at this point the waters are so muddy it’s impossible to tell. I have absolutely no faith in anyone online at this point, and most of us are here in the Fediverse specifically because we’re so sick of the crazies all over other social media. I can easily believe there are people that would share exactly what you typed above and mean it.
Frankly, sarcasm is already the laziest, most braindead form of humor anyway. If you can’t even be bothered to at least make it clear you’re joking, it’s really a ‘you’ problem if you get misunderstood.