other tone markers I'm more likely to do tbh (/gen). some people do struggle to get certain things, and tone markers can help move communication along.
sarcasm is supposed to be a facade. you dont fkin mark it!
Something I notice a lot in asian languages is that the asian languages I do speak (Thai and Mandarin) are more situation dependent than english. It would be the listener's fault to discern whether one is being truthful or sarcastic. I believe this is the other way around in most european languages. Bear in mind that this was something I learned many years ago, so feel free to correct me if I am wrong.