Should he say something to her?

Meg • TTC after losing our baby girl at 37 weeks 👼🏻
Okay, so I just got married this last Saturday! (Yay me!) My now husband has a son with another girl. We've been together for 4.5 out of the 6 years of his life. His son, calls me mommy (we tried to fix this by telling him to call me megan from the start but he was 1.5yrs old and my kids called me mommy and he couldn't say megan...we really tried for the first two years). We eventually gave up and she seemed okay with it because he called her Momma and me Mommy. She does however, hate me even though I've been super helpful for her schedule with him and have been there for their son for everything. She still bad mouths me to the son and to my husband.
Anyway. The day after we got married, we called his son to tell him the news (it was a destination elopement with no kids). My husband said "Guess what! Dadda and Mommy got married!" I said hi also and that we loved him. An hour later his mom texted my husband and said she heard everything, we were on speaker phone, and I am not his Mommy. She's been fine with this until now. My husband said he would say something because that was rude and no sense in causing drama after so long of this. But now he's changed his mind and He thinks he shouldn't have to say anything because she'll just get mad. 
So what would you guys want your husband to do? 

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