"‘You shall do no injustice in judgment. You shall not be partial to the poor, nor honor the person of the mighty. In righteousness you shall judge your neighbor. 16 You shall not go about as a talebearer among your people; nor shall you take a stand against the life of your neighbor: I am the LORD. 17 ‘You shall not hate your brother in your heart. You shall surely rebuke your neighbor, and not bear sin because of him. 18 You shall not take vengeance, nor bear any grudge against the children of your people, but you shall love your neighbor as yourself: I am the LORD."
It is far easier to indulge yourself with annoyance, grudges and hatred than it is to go talk to someone you've come to begrudge or hate. It is far easier to talk about them to someone else, instead of talking to them directly. It is hard to love, but as the Spirit trains us in His ways we come to see they are ways of peace, delight, and joyful fellowship together in the Lord.