There are separate functions on ET found within your profile account settings. One for ignore and one for block. I have explained their intent and how they are supposed to work.
The intent of Block on ET (and other social media platform0 is that the person you blocked is unable to see the content you posted. Unfortunately the ET forum software has some shortcomings which makes both ignore and block easy to bypass.
Puts member on block
Reads the posts of member on block
Responds to the posts of member that is placed on block