WTH would say that?

back story: me and my husband of 2 years have kids from previous marriages, my ex is fine we all get along..his ex is hardest person to deal with.. calling the cops over stuff like a pair of pants, making accusations against us..ect. So last night the kids had a dance recital (we have them Tuesday and weds nights every week per court order) so we got kids ready, they looked amazing! sat in the audience and watched.. of course their mother was there, we just kept our distance. One of the kids were acting it like she was showing off because she saw her mother, my husband was correcting her telling her to watch the show and telling her its was rude how she was acting.. after the show their mom comes up to her saying her daughter's behaviors were okay and that she doesn't need to listen to their dad, or me.. in my head im like who raises their kids to disrespect adults, my kid has a step parent and I always remind him on a drop off to listen and be respectful..