Dinner with the in-laws

So just got back from dinner with mil sil and fil. Everything was going well until mil started talking about kayaking to which I responded with I live doing that, she then stated very rudely and sarcastically "well if you could trust me enough to watch the baby for a few hours maybe you and your fiance can go." I was absolutely livid because she knows why I don't trust her and why I'm not comfortable around her and she's yet to have an adult discussion about it with me to try and start mending things, mind you I've know this woman for a year and a half now and she acted completely differently to me during my pregnancy as to when my son arrived. But anywho I spoke with my fiance about what she said and how it was said and my feelings, and he didn't seem to care. Like this woman doesn't make any plans to come see my son. And then complains about how she never gets to see him. But yet she only makes these comments when there's a crowd around, like oh I wanna go shopping with you or come see the baby sometime to which I always respond with ok well let me know when you want to or when you're doing something I'd love to join, I don't like the woman but that doesn't mean if she's actively trying to be a part of our lives I'm gonna ignore her or not actively make plans. It's driving me nuts. And I'm finding it very difficult to choke down what I've got to say about it