Maybe my habit of spending 10 minutes a week reading YouTube comments has made my skin thicker than before, but I wouldn't call Dan's tone "disdainful". Exasperated, yes. Impatient, yes. Frank and direct, yes. Disdainful, not that I can see.
Here's the problem with your generic, helpful feedback: my eyes keep slipping past it. I'm pretty sure I'm not the only one who ends up having to expend more effort trying to read bland and insipid content, so tailored to avoid offending anyone's sensibilities that it shows.