Likes ...
PA IL IN
PA SC AL
SC AL AR
IN VA DE

MA RI NE
AL MO ND
AR CA DE
CA ND OR

VA ND AL
OR DE AL
CA ND ID
MO DE MS

NE CT AR
DE CA DE
DE RI DE

But Dislikes ...
HILARY
NEWTON
VECTOR
DEFEND

SEAMAN
CASHEW
SPORTS
MALICE

MUGGER
COMBAT
HONEST
ROUTER

PLANTS
MONTHS
PRAISE

My friend likes six letter words that are formed by three state abbreviations.