What accounts for the increase in misreading on social media?

I am noticing that people misread each other more often on social media sites. They are not just reading each other uncharitably and twisting each others’ words like they’ve been doing all along—their responses show failures in reading comprehension.

Could it be . . .
. . . more people are using smaller screens, which make it harder to take in texts that are longer than ~140 characters?
. . . it’s another effect of the polarization of society—people jump to conclusions about what other people are saying without fully hearing them out?
. . . people don’t really listen to each other in RL conversation, and now this conversational pattern is bleeding into online conversation?
. . . the increased prevalence of synchronous online communication (e.g. chat and texting) over asynchronous (e.g., forums and email) means that people are more likely to respond immediately without reading carefully or thinking through their responses?
. . . educators aren’t adequately teaching students how to read for content?
. . . people’s attention spans are shorter due to (the usual suspects blah blah blah)?
. . . something else?