AITA for maintaining my right to call FIL’s wife “Birkin girl” because that is all she will ever be to me?

For ten years, she’s held onto a nickname that everyone else seems ready to forget. What started as a sarcastic jab during a messy affair has turned into a long-running family feud, and now it’s threatening to fracture relationships for good.

The woman insists she has every right to call her father-in-law’s wife “Birkin girl,” a reference to an expensive handbag he once gifted her during their controversial beginnings. But after a heated confrontation in his own home, she and her husband were kicked out. Online, people had plenty to say — and most of it wasn’t in her favor.

The tension traces back to a scandal that never truly faded

As the marriage collapsed, the nickname stuck around

Now even her husband is questioning her motives

At the heart of this conflict is unresolved resentment. The poster clearly sees herself as standing on moral ground. She despises cheating and believes the nickname is justified. From her perspective, it’s a reminder of wrongdoing that shouldn’t be glossed over just because time has passed. But from the other side, ten years is a long time. The marriage ended, the affair partner became the wife, and life moved on.

Her father-in-law likely sees her behavior as a constant public shaming. Being mocked in his own home probably felt like a deliberate provocation, especially after a decade of tension. Dr. John Gottman, co-founder of The Gottman Institute, has long warned about the impact of contempt in relationships. He explains, “Contempt is the single greatest predictor of divorce.”

While he was speaking about romantic partnerships, the principle applies broadly. Persistent mockery and name-calling chip away at any chance of mutual respect. If the goal is peace, practical steps matter. First, separating personal values from other people’s marriages can help. It wasn’t her relationship, and she wasn’t the betrayed spouse. Second, if visiting feels unbearable, limiting contact is a valid option.

Finally, open communication with her husband is essential. If he wants a relationship with his father, finding a compromise — even simple civility — may protect their own marriage from unnecessary strain. Standing against cheating is understandable. Turning that stance into a decade-long feud may be costing more than it’s worth.

Here’s what people had to say to OP:

Many users were blunt, arguing she crossed a clear line

Others tried to inject humor or pointed curiosity

And some commenters added humor or sarcasm to lighten the tension

This situation isn’t about a handbag anymore. It’s about pride, resentment, and whether holding onto old anger is worth damaging present relationships. She feels justified in calling out what she sees as moral failure. Her in-laws see someone who refuses to let the past rest. Ten years later, the affair is history — but the bitterness clearly isn’t. What would you do? Keep the nickname out of principle, or let it go to protect family peace?