Answer: This behaviour is an example of DEINDIVIDUATION.
Explanation: Deindividuation is a loosening of self-restraint when anonymous in a large crowd.
This behaviour makes an individual see himself as a crowd instead of an entity. This makes the individual do whatever the large crowd is involved in.
(1) The work must be " fixed in a tangible medium of expression ." This means the work must exist in some physical form for at least some period of time.
(2) The work must be original...it can't be copied.
(3) The work must be the result of at least some creative effort on the part of the author.
Stereotypes can be based on all of the above.