Is it trolling to explicitly refuse to ping "missing" when the enemy laner goes missing ?

Hey, So I was in a game where I got a few early deaths because another laner didn't ping "missing". So I just asked them politely to please ping "missing" if they notice the opposing laner is missing, as I assumed they were being inattentive or new. The reply was along the line of "stfu, just use the minimap". So, does it count as trolling and should be reported as such, since the player is _deliberately_ refusing to do part of his "job" as a laner ? Once again, I am not talking about someone who tries but fails to do so. I am talking about someone who knows he should but refuses to do it. So, what's your take on it ?
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