Not as an enemy, but as an ally.
He generally out performs everyone on his team, taking the fun of securing kills for yourself completely out of the game. He doesn't look after his carry, he looks after himself and tosses whatever leftovers at whatever ally happened to do some or most of the damage.
His kill participation is generally the highest on his team while his carry is made to look like an absolute joke by comparison. It's annoying when you're trying to improve as ADC, but your support is literally designed to make you look bad and then proceeds to do so.