AITAH for not speaking to sister in law for calling me stupid

I 32F married to 35M, announced I was pregnant with my 4th. My sister in law who is very blunt said I was stupid for being pregnant again, she has no kids or desire to have any. I spoke to my husband about feeling mad and disrespected, his response was nothing at the time, I've brought this up again and i was told I don't need his protection from her, I'm an adult. Brought it up again recently after she visited and he said it gives me no right to be cold towards her, that I need to adjust how I react to people and still need to be respectful to visitors of our home, that she has a right to her opinion. In his opinion it's how i could have handled it better, that's just the family dynamic, the person who brings up a problem usually becomes the problem and they don't seem to like being challenged or pulled up. So AITAH for not speaking to her anymore or avoiding any interaction with her?