Readers in general can be very generous and understanding towards their favorite authors but that is on the premise that authors properly inform their readers about decisions, events, reasons etc. but most important is that they are honest towards their readers. For instance if you promise 5 chapters a week and don't make it than don't just gloss over it and post the next chapter but properly explain why you were forced to miss your promise. There is always a good reason but if you don't give that information to your readers than to a reader all that they know is that this author has missed a promise (and if that happens often some readers will label that author as unreliable and start treating that author with less respect). My point is that some disrespectful messages can be avoided if the author is honest and clear about what their readers can expect from the author. We're living in the social media age and webnovel.com is a perfect example of a site that heavily relies on social media interaction. The key to social media in general is that readers/followers feel that they have a close relationship to the person they follow and that close relationship is at the same time the reason why people are willing to give money and support others but also the reason why social media can turn toxic. Just think about it, if you have someone who you think you have a relatively close relationship with ignore you or not acknowledge your existence than how does that make you feel? And whenever an author makes a promise and does not keep those promises than your readers are going to feel betrayed. And I realize that it is absurd that some people think like this but this is how social media works. What I noticed is that the people who have the least amount of angry trolls demanding stuff from the person they follow are the people who are very clear on what their followers can expect from them, be generous in the information you give.
And one tip for authors who have trouble with demands for more chapters... don't see those messages as a whip urging you to work harder but see them as encouragement from people who like your work enough to ask for more. This change in perspective is probably a better way to look at these kind of messages from a mental health perspective ;-)