What does it 'blocked'mean?

From flickr FAQ.

In flickr, people you block can't interact with you or your photos. In practice this means they:

• Can't comment on your photos. All comments on your photos that they make are deleted.
• Are removed as your contact, and you are removed as theirs. They can't add you as a contact again.
• Can't add your photos as favorites. Any of your photos marked as their favorites are removed.
• Can't blog your photos
• Can't add notes or tags. Any notes and tags they added to your photos are removed.
• Can't send you FlickrMail

People you choose to block are not notified that you've blocked them. This is not true! The page clearly shows '... is blocking you'.

Someone is blocking me. What's up with that?

Blocking is a simple way to make sure that everyone is comfortable. If you've been blocked by somebody, it is most likely your interaction with them is outside their comfort zone.

really? did I do anything? tell me then. I just don't like the feeling to be 'blocked', in anyway.