Bully: a person who uses their strength and/or power to harm or intimidate a person who is weaker over a given period of time.
Criticism: is the analysis and/or judgement of the merits and faults of a literary or artistic work.
Please, read that again. And again.
One more time so it sinks in.
Now you understand the definitions. Please, explain to me how you can be labeled a bully by an author for simply discussing their precious novel that is riddled with errors.