For me, if you heard me say "they are not Christian", it would be a phrase to mean:
"If you want to call yourselves Christian, then act 'Christ like' "
"Christians" say that Jesus was humble, or kind, or compassionate, or stood up for what was right, did not cave into hypocrisy. "Christians" say that they are "followers of Christ"
So when this type of person acts the opposite of "Christ".... I say, "they are not Christian"
Just as when a Vegan eats meat all the time.... Can we really call them 'Vegan'/