All caps - Wikipedia …
“Short strings of words in capital letters appear bolder and ‘louder’ than mixed case, and this is sometimes referred to as ‘screaming’ or ‘shouting’.” […] “Studies have been conducted on the readability and legibility of all caps text. Scientific testing from the 20th century onward has generally indicated that all caps text is less legible and readable than lower-case text.[2][3] In addition, switching to all caps may make text appear hectoring and obnoxious for cultural reasons, since all-capitals is often used in transcribed speech to indicate that the speaker is shouting.”
And I don’t want to ignore our Google search AI Overlordview with this actually very useful summary it gave me (including the highlighting) …
"AI Overview
Using all caps on the internet is generally considered rude and is often interpreted as shouting. It’s best to avoid using all caps for emphasis or highlighting, and instead use proper capitalization and punctuation.
Why it’s considered shouting:
Using all caps has become a widely recognized convention for conveying shouting or yelling in online communication.
All caps can be harder to read and visually overwhelming, making it feel like someone is raising their voice.
It can be difficult to convey complex emotions or intentions with all caps, making it seem like you’re simply yelling without any specific reason.
Alternatives to using all caps:
Use sentence capitalization (starting sentences with a capital letter and using lowercase for the rest) for clarity and professionalism.
- Emphasis with italics or bolding:
Use italics or bolding to highlight key words or phrases, but use these sparingly as well.
Use exclamation points to indicate excitement or emphasis, but avoid overuse as it can also be perceived as shouting.
- Clear and concise language:
Choose your words carefully and express your ideas clearly and concisely.
In essence, while all caps might be tempting to use for emphasis, it’s generally best to stick to established conventions of online communication and use alternative methods for highlighting or expressing emotion.
AI responses may include mistakes. Learn more"