Interesting point. One of the challenges is that this form of communication isn’t nuanced, so sarcasm, dry humor is ripe for misinterpretation. I tend to assume someone isn’t being serious. If they were to say the same thing to me in person, where non-verbal cues dominate communication, I’d likely not give it a second thought.
Alternatively , in my case, since I seem to be on-line a lot, it could be the case that I’m a socially, maladjusted oaf. <appropriate emoji> I favor the first explanation.