There are several ways to back down:

1. One way is to share with the other person your own feelings about the situation without accusing anyone. It might be a paradox because you show your 'weak' points and yet this can become very strong.

2. You can say jokingly:

"I forgive you for [asking this question]/[talking about this topic] if you forgive me for not [answering you]/[continuing talking about this topic]

3. There is the technique of the broken record:

repeat the same sentence over and over.

4. Learn tai chi and you will start to understand what it means to take the energy of the other and use it :-)

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