YES! Block button would be awesome for the unhappy little creatures that leave their rude comments. I've only had a problem once, and to this day I still don't even know what started the comments.
The other day my husband got a message on his RS wall-- it literally said "This place is ugly, your a loser!" So he tipped them and wrote 'Thank you so much! Have a great day!!' on their wall, little brat responded back and literally said she liked his attitude and was just looking to see what people would say to her if she were mean- then had the nerve to ask him if he wanted to be neighbors. He didn't respond...
YES TO THE BLOCK BUTTON!!!