Yes, I have someone I ignore, but you still see their posts, with a message that ‘you are ignoring this member’.
I like highlighted posts. I use purple, simply because I don’t like red. Even when I was teaching I refused to use red and it got me into strife with more than one Principal.

The use of colour and underline is simply highlighting, as is the use of ‘bold’, nothing to do with shouting.
Jamjar