# Why is it considered rude to use all capitals to ask/answer a question? [duplicate]

I'm asking a serious question, sometime the warning even show up when it's not capital letters in the description but equation. For example, even if I just type in

$A^2+B^2+C^2+D^2+E^2+F^2+G^2=H^2$

in a new question thread I still get a message

DON'T SHOUT! All-caps posts are considered rude and will be quickly deleted.

which I don't get it. Can anyone explain why the system needs to ban ALL CAPITALS?