Anything by Linus Torvalds.

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I'm having an issue using the settings. I'd like to use the application with a specific UI - greenish background, black text, highlighting what's selected. The way I've configured it sort of works, but has a white background when I move the cursor around. Here are the settings I’m using and a screenshot of the problem.

There's nothing unfriendly about that. It just doesn't go out of its way to exude overt friendliness, is all.

'Unfriendly' does not mean the opposite of friendly. It means it is not friendly.

So that is by definition 'unfriendly' - because it does not exude any friendliness.

Just because it is 'unfriendly' does not mean it is 'rude'.

I'm pretty sure your definition is not the one most people use. Google for sentences containing the word "unfriendly" and I'm pretty sure 90%+ of them (if not 99%+ of them) use it as a milder version of "rude", not as "showing no signs of friendliness or rudeness".

To circle back to the point of the original comment, my point was "constructive" and "friendly" are describing different characteristics, and "rude" does not automatically imply "unconstructive" (and of course "constructive" does not imply "kind" either). That fact is precisely what necessitated your use of the word "friendly" in your own comment. You can see this if you Google too—the top result I get when I Google constructive criticism meaning [1] says constructive criticism is "a feedback method that offers specific, actionable recommendations". That's all it means.

[1] https://www.google.com/search?q=constructive+criticism+meani...

I might describe it as a little cold. Since I have no contract with the developer, I’m effectively asking for a favour. Perhaps I’m just awfully British about it.