Why should that be a concern of yours? Especially in the context of this mode of communication. Could it be that the cult of personality is inherent in Protestant expression and being able to divine motive/sincerity is explicit in determing truth. The Donatist tendency emerging most often expressed as, "he doesn't speak to me. I'm moving on to the next ecclesial community down the road."
Because we are told to.
1 Timothy 5:20 Them that sin rebuke before all, that others also may fear.
Titus 1:13 This witness is true. Wherefore rebuke them sharply, that they may be sound in the faith;