how to block a rude player
http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=121
Sorry you had to deal with a rude person, Brian_of_Bozeat. I'm sure you've noticed that 99.99% of chess.com members are the salt of the earth, but unfortunately an immature person does get in once in a great while. Happy playing.
Abuse can also be reported to the site mods:
http://support.chess.com/index.php?_m=tickets&_a=submit&step=1&departmentid=5