Too slow to know right from wrong…

So this woman is way too touchy feely with my DH. She’s technically his stepmother but she’s not that much older than him. His dad says “She’s Filipino; they’re just very friendly people” as a reason she calls my DH inappropriately including when we were on vacation. Now the excuse is, “she’s slow”. So now I’m supposed to accept her behavior because she’s slow. The woman runs a business and has three kids but she’s too slow to know she shouldn’t touch other womens’ husbands? But I’d be wrong to beat her azz ig.