What Christina says makes many sense. There’s a twister dynamic between the marriage. And as much as you don’t get involved in this issue, the better.
What it was really hard is you being insulted by your mother-in-law. Why in the Earth she just behaved this way? Didn’t she apologise? Is she normally like this with other people?

Thanks god you could both enjoy a time alone and kind of get clean from the bad vibes.