1 John 4:20 If someone says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen, how can he love God whom he has not seen?
Black and white are pretty different; but are a variation of the amount of colour being seen by us. Hot and cold do not feel the same; but they are a measure of the amount of heat as seen by us.
Love and hate, on the other hand are not a measure of the amount of love or lack of it. So when we say that we love God we open our hearts to Him, totally.
But to hate someone is more than just closing off your heart to them. So how can you have love for a God you cannot see and yet say that you can have room to hate anybody as well?
God created us all. Colours may matter. Heat may matter. Love is simply required!