I was going to make a sarcastic comment about the silliness of the thought that since you haven't had the same experience then the author's complaint is invalid

I was going to make a sarcastic comment about the silliness of the thought that since you haven't had the same experience then the author's complaint is invalid. I don't think it's necessary though. After all, if it hasn't happened to you then there's no way it has happened to someone else, right? Plus, your automatic assumption that he's a bad coder is part of the problem the author is complaining about. You know nothing about his code therefore an assumption, positive or negative, is not something you can make.