Does anyone know why/how typing in capital letters came to be regarded as equivalent to shouting in spoken conversation? Sure, real-life shouting is pretty rude, but capital letters are just symbols on a screen - how can they really upset anyone? I've seen several questions posted on the AB in capitals and the first response is not usually a helpful answer, but some clever dick saying "stop shouting". I think it's all a bit childish, really.
It's all just come as a way of expression i guess. you could argue why an exclamation mark is considered as a sign of alert, warning or danger as it's just a line and a dot, but again its a sign of technological expression.
Using capitals in text is one form of emphasis much as shouting is one form of emphasis used in speech - and both can be considered to be not very effective.
There have been many scientific studies which indicate that reading capitals is less efficient (i.e. slower, more arduous) than reading the equivalent text in mixed case.
Thanks. It also seems that many of the people who make such a play of being offended by text in upper case do not have a similar regard for other conventions of written English, such as spelling, punctuation, grammar and syntax.