Is it right to tell your partner's parents you got cheated on?

My brother got cheated and exposed that on FB, told friends and both families. However, the girl's parents weren't very kind towards him when he told them the details. The mother cursed him out for posting that on FB and how petty he is. The father's reply was along the lines of ''Maybe she got bored. I fail to understand why are you even sharing this with us. What do you want me to do with this information?

The girl's parents used to get along with him but after the break-up, not anymore. It's very clearly they were defending their daughter (their only child), even when there were evidence proving she was 100% in the wrong. They both unfriended him and blocked him from FB. She cheated with one of my brother's friends several times.

He was shocked at their reactions. They were sweet to him when he was in the relationship with their daughter but when it's over, not anymore. If your partner cheats, is it right to share this with their parents?

Is it right to tell your partner's parents you got cheated on?
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