When shouting, people use CAPS.
When I respond to another person's posts when I'm quoting them, such as this:
"No one ever overdosed on marijuana and died from it."
I respond like this to distinguish my comments so when I'm looking at my pings, I can see which are my posts and which are others. They are no indication of emotion whatsoever, unless, again, I employ CAPS. Now carry on. :-)