I don't know that you can "love" an annoying person, but you can try to be understanding and compassionate. Everyone has their quirks and personality traits that may be seen as annoying by others. If you can remember that everyone is fighting their own personal battles, it might make it easier for you to have compassion for them. Additionally, try not to take their behavior too personally; after all, it's not about you, it's about them. Finally, if all else fails, simply distance yourself from them as much as possible.