Though people who read can't hear if you are actually yelling, they are reading your words. If your angry you will subconsciously choose words that express your anger even if you mean too or not. So single words in one word sentence to drive a point could be viewed as yelling or shouting to someone. But this is not the case here. On the Internet there is common notion that when you place all the letters in a sentence in all capitals, you're shouting.

THIS IS CONSIDERED AS SHOUTING.

See the Point. : )

So if your going to shout to prove your point then you better be right about shouting.