Professional Hater
Someone who criticizes so constantly or skillfully that hating seems like their full-time job.
“He found something negative in every vacation photo—professional hater.”
The phrase can condemn relentless negativity or jokingly admire creative criticism.
Professional is used humorously to imply unusual dedication or expertise at disliking things.
full-time hater
A close variation.
paid hater
A joking version.
career hater
A person devoted to criticism.
Is professional hater a real job?
No. The phrase is deliberate exaggeration.
Can it be self-descriptive?
Yes. People sometimes call themselves professional haters as a joke.