He Being What Not.

He is a leech
 speaks with a screech
 applies bleach
 could not be reached.

He is a parasite
 has no insight
speech is like a bite
 keeps himself out of sight.

He is a nag
 pretends to be a stag
 incessantly brags
 could not be easily tagged.

He is a fighting cock
  poses  to be strong as a rock
 his replies come with a block
confines hiself behind a lock.