I do agree with what umNO on GuruGossip had to say about it all:
"However Wendy invited people to go insult Peter on his twitter. No one here invites people to go harangue MP nor XX. We present our opinions and let people come up with their own conclusions. That is the main difference. Both MP and XX invite their followers to take action against people they've targeted. Lesson/medicine blah blah bleh whatever bullshit excuse they want to give it, once you call for action, you are using your online presence to bully. A fine line, but it is there."Well said.
Oh, you wanted a picture? Here you go... (click to enlarge)