For the first two years after my brother got married, I couldn't stand his wife. I thought she was controlling, distant, and always judging our family. I was polite to her face and complained about her privately.
Then during a family argument, someone made a cruel comment about my failed business. Before my brother could say anything, she defended me so fiercely that the entire room went quiet. Later she acted like nothing had happened. That was the day I realized I had judged her based on almost nothing. We're close now, but she has no idea how much I disliked her in the beginning.