trolling: A troll is someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as an online discussion forum, chat room, or blog, with the primary intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.
snark: Use of sarcasm or malice in speech. A smart ass remark.
harassment: To annoy persistently: to create an unpleasant or hostile situation for especially by uninvited and unwelcome verbal or physical conduct.
ect (etcetera) : A number of other things or persons unspecified.