Any accomplished writer is keenly aware of the tone of voice they choose. So if they use profanity, assume that it's a deliberate expression. In this case, it's

Any accomplished writer is keenly aware of the tone of voice they choose. So if they use profanity, assume that it's a deliberate expression. In this case, it's their way of expressing how low they think of the idealized stereotype of aspiring writers that don't read, rather than a particular person. It's very obviously not aimed at any one existing person. If you assume that this is a directed personal attack, then you're misreading the text.