I am truly sorry you had experiences of childhood abuse. It is quite heartbreaking the trauma passed on from exactly those who supposed to not only love us, but protect us and nurture us.
I have few things to say and I hope you take what you may need and take others maybe just a hubris.
You are a new mother. This is truly one of the most changing personality, self organization and life in every single woman who had a child (for good or for worse - hence why we ended up with women who were quite mildly putting not enough mothers/parent).
So it is possible you are super sensitive, super aware, alert, and in significant and fundamental change in your self organization because you had a child recently....
This change may open your eyes (almost like out of dissociation) things you never noticed including who your husband is. Maybe you interposed the need for support before but now, he is not...or maybe you are so alert that everything he does makes you trigger because you are watchful for good reasons - becoming a new mother.
The topic of the training did not help either. I mean I remembered when I was estranged from my mother and everybody would be like oooh my mother's love is so important...and made me feel like I was a bad person...ooh yeah I remember those days. But I realized people who are in wound, go at least (or more) two ways: those that ask everybody to put a bandaid on (cause they do) or those that understand you and see this is your story and hear you out...you can imagine that person in the presentation was just a parrot of the book.
and your husband's validation is (I am very sure grating on you now), but if you ever get therapy, and start to integrate, you will learn sure we all hurt but utlimately honestly, no one can invalidate us without out permission. His opinion is not stronger, higher value, or more important than YOURS. But if you are an abused child, adult having children without clearing some serious trauma pipes, you will find "others' just like our parents were, are always above us and their feelings, observations, input is more acutely painful.
I honestly do not know how or what you can do about your husband (and the racism thing is weird), but I hope you cultivate a support system for you (friends, therapy, groups etc) and you start to notice how you may be changing. Becoming a mother, IMHO, of what I observed in others, is one of the most healing path if recognized by the person. It can wake you up or exacerbate your trauma.