Dissing
Overview
Disuru, or dissing, is slang for criticizing someone, putting them down, or bad-mouthing them. It comes from the English word disrespect and spread through hip-hop culture. In Japan, it began to be used online in the late 2000s and is now used in everyday conversation too.
The difference between "criticism" and "dissing" is whether it's constructive. Criticism aims to help the other person improve and includes specific points. Dissing aims at putting the other person down for its own sake and offers no constructive suggestions. "That answer misses the point" is criticism; "That answer's so boring" is dissing.
Dissing in a question box
Because a question box is anonymous, it easily becomes a breeding ground for dissing. "Aren't your answers boring lately?" "You're losing followers, are you okay?" "X is way funnier than you." These take the form of questions, but in substance they are dissing. The sender's goal is not to get information but to make the person answering feel bad.
A dissing question is marked by a lack of specifics. "Boring," "meh," "you were better before." There's no specific point about what is boring or how. Negativity without specifics gives you nothing to improve on. That's exactly why it's dissing and not criticism.
Dealing with dissing
The first thing that helps with a dissing question is to ignore it. The goal of dissing is to provoke a reaction, so not reacting becomes a way to counter it. Arguing back plays right into their hands, and showing that you're hurt can make it escalate further.
If you do answer, one way is to turn the dissing into constructive criticism and reply with that. To "Aren't your answers boring?" you can reply, "Which answer was boring, specifically? I'd like to use it to improve." If the sender really wants you to improve, they'll probably answer specifically; if dissing was the goal, they'll go quiet. This way of replying also tends to work as a filter that separates dissing from criticism.