There is no ambiguity that needs further clarification, I am talking about the words as written. Their entire message clearly conveys they believe there is an objective design standard that everyone should strive to adhere to, and they are criticising a website for daring to deviate from their ideal standard as though it were an objective flaw and not a matter of personal preference.

> getting upset over blatantly subjective matters being discussed with zero cushioning like this, then I'm doing little more than intentionally misreading the other person until I upset myself. You're reacting to the smoke, not the fire.

It's not about cushioning. They are explicitly criticising the website ("pity", "forgot to take basic principles into account"), and saying broadly that everyone should do X, where X is their own preference. That is the fire. That will invariably rub people the wrong way. It is inherently not an amicable way to communicate about differences in design opinions.

That's not to say you can't give critical feedback. "I'm not a fan of the font, I prefer fonts that are easier to read" would be perfectly reasonable. It's specifically the assertion that there is a way that things ought to be done, as though there are not trade-offs depending upon what each person values but rather one objectively superior way, that causes friction.