You seem very upset at the fact that I see verifying 100 barbers as too much work. And you don't want to answer my question as to how you'd know who's a serial killer because you wouldn't be able to without someone telling you or you looking it up.

It's Merriam Webster. They chose to add the word "discrimination" to any word using "phobic" that's centered around people, yet don't do that for any other "phobic" words. They also don't define "phobic" using the word "discrimination." So, you can probably see how they've adapted Greek words to mean whatever they want them to mean. By you using the word, you are saying you agree. By agreeing, you are changing Greek words that have been established for about 2400 years and choosing when and when not to add the meaning of bigotry or hatred to the suffix "phobic." You are picking and choosing when and where "phobic" means one thing vs another.