How do I respond to my MIL’s text about my FIL fighting with my husband?

I posted about this a few days ago but can’t seem to edit my original post and I have another question about it, so this is an update of that post with a new question.

My husband’s parents live an hour away. They work full time but come over almost 2 or 3 weekends each month. His dad likes to help my husband with yard projects and stuff. Since my husband and I bought our house together, it’s become a bit of an issue because his dad thinks and acts like he owns the house with us. I love to host them and make them feel welcome, we even have a designated guest room for them because socially we enjoy having them here and they are our only babysitters right now in our new town. But last weekend they spent the weekend here, and around 1pm Sunday I go outside to find my husband alone outside and his parents gone. He didn’t know if they were coming back, they basically left in a huff because my husband didn’t agree with his dad’s advice on where to put our new shed. It became a giant argument that lasted into the night via calls and texts. My husband kept trying to move on but his dad would send these paragraph long texts and voice memos rehashing it and talking to him like a child. To be fair my husband called him a few names as well.

This week my FIL has off from work and assumed he’d come over on Monday to work in our garden and I don’t know what else. The exact day was never discussed with us, and I had already planned with my husband that his dad can come but I want him to be home too so it’s not just me and his dad all day (I’m on maternity leave with my son at home) and so that my husband could be with him in person instead of my FIL constantly calling him at work asking questions and arguing like I know will happen. So my husband told him that later in the week is better but FIL flipped out and it escalated to a big argument again where he was insisting that my husband previously agreed to let him come over on Monday and husband kept trying to deescalate the argument and move on but FIL wouldn’t allow it.

I really hate when his parents treat him like a little kid and throw a fit to get their way. It feels condescending. I don’t want to be home alone with my FIL because I’m really uncomfortable with how they treat us lately. My MIL told my husband that we would be stupid to not let him come over Monday bc he was already planning on it and is upset now. So now I take it as she’s calling us stupid which is even more awkward.

I ended up putting my foot down and said no to him coming Monday. We suggested Tuesday. He said that’s a bad idea because it splits the week in half, so he said Thursday instead. Idk how that’s any different, but fine. So he’s here now, my husband is home too. No fights yet but he is staying over until tomorrow and will be here tomorrow while my husband is at work.

Here is my question. Today out of the blue my MIL texted me and said something like ‘Hi! I hope (your husband’s) and his dad’s fighting doesn’t irritate you too much’ and then told me about something she sent with FIL for us. I don’t understand the point of her text because she was just as much part of the fights as FIL was. She was texting my husband trying to get him to let my FIL come over and telling my husband were stupid. I am 4 months pregnant and it seems like everyone is just dumping stress onto me and I’m really trying to ignore it. I have a therapist and she told me to let my husband handle his parents, like not even talk to my husband about them bc it’s so triggering for me. The sound of MIL’s voice is enough to make me angry right now. So what should I reply? I really do not want to get into a back and forth. Is it ok to just not respond?