Likes ...
Byron
indigo
onions
Topeka

atom
fortune
inner
often

upper
overture
office
wither

Ford
Attila
Fromm
integers

But Dislikes ...
David
blue
garlic
Kansas

molecule
riches
outer
never

lower
sonata
home
wilt

Reagan
Genghis Khan
Freud
decimals

Can you figure out why my friend likes certain things and not others?