Wife’s critizes my kids ib front of our friends

Hi Coaches,

Whenever we are around other people my wife ends up criticizing my kids. I always buy into it and bicker with her in front of our friends. She has so much pent up anger about her step children and I’m sick of it. There is no way I can talk to her about this as it always ends up in a huge fight. I would love to be able to ignore it but I’ m not sure if i should be doing something else more healthy. Please advise.