A creep has many definitions. White knights and feminists define a "creep" as someone who does not respect a woman's boundaries instead of it's obvious meaning of a man just being ugly. This could include cold approaching a woman or interrupting a woman when she's busy reading a book or playing with her smartphone.
The term "creepy" is intentionally ambiguous. Women know that if they were being completely honest and said "short guys or any man under 6 foot should eat dust", they would be viewed unfavorably and shallow. Therefore, in order to blameshift, or to covertly act like a chameleon and having a constantly moving goal-post with regards to their moral compass, an ambiguous term such as "creepy" is a welcome adjective in the chameleon's vocabulary.