Are you equating 'appreciate' with 'like'? Misuse of the word.

Appreciate 1a: "to grasp the nature, worth, quality, or significance of;"... 1c: "to judge with heightened perception or understanding ..."

Understand 1a: "to grasp the meaning of," ...2: "To achieve a grasp of the nature, significance or explanation of something."

Webster's Collegiate Dictionary.
Succinctly stated- Two aspects of comprehension in bed with one other.