MIL Trying To Get Husband To Cancel My Graduation Vacation Am I Being Selfish

I just graduated with my Master's Degree while pregnant with our 2nd child. All I wanted to do as a celebration is go on a vacation with my family and we are going away to a beach for a week. I did not know my husband didn't tell his mom. I brought it up and she was upset. My husband can't swim and has no intentions of ever learning how to swim. My husband is the absolute strongest person I know and has survived things I would have never imagine going through. He's an SA survivor by several family members and 9 years ago these family members through him in a river thinking he would die since everyone in his family knows he can't swim. He just got lucky and washed up back to land and someone found him. He doesn't like water all that much but he's at a point in his life where he will stand on the shallow end. His mom was really upset and said he doesn't need to go to a beach and that there wouldn't be anything he can do there. My husband said there's other stuff he can do at a beach besides swim like build sand castle with our daughters. Then his mom started saying stupid things like what if the tide pulls him in and said "You think her pregnant ass will help you?" Which offended me. She said if we want a vacation it needs to be somewhere that isn't near water and somewhere that she can get to us if we need her help which we won't need her help. She's been trying to convince my husband to cancel the entire vacation and told me it's ridiculous that I want to celebrate getting a useless piece of paper at my age that I probably won't do anything with since I just have kids. My husband is the type that tries to reason with people and not step on any toes. So he will "talk" to his mom and she will be yelling. Everyone in his family and even MY family is always saying I should be patient and have sympathy for his mom. I get it. I would kill a family member who hurt my child. But at the same time my husband is 27. He's a grown man. He is old enough to know what he can and can't handle and we don't need mommy's input all the time. This isn't the first time she's done things like this. My husband was going downtown at night to get me food and his mom found out and for a week called me selfish for sending her baby boy somewhere at night. I'm not downplaying my husband's situation at all.... But sometimes I feel like she forgets that FAMILY did that to him. He wasn't hurt and kidnapped and thrown into a river by some rando in the street. It was FAMILY! Any who she keeps pushing this shit. Saying I'm selfish and should be thinking about her babies feelings even though her "baby" isn't against going. He's fine with even just sitting in the water.

@Casey she was saying what if the tide drags my HUSBAND in not our kids and yes I could save them. I'm pregnant but I can swim. I'm allowed to be angry at a women putting down the hard work I went into getting my degree. I'm allowed to be upset at a women calling me selfish for going to a beach when my husband is fine with it. I'm allowed to be angry at a women yelling at me for sending my husband to a store at night. Like she wants to live in the past and wants to husband to live in the past with her. He wants to move on. He's allowed to move on. Just because she's not ready to move on from what happened doesn't mean she gets to hold him back from his healing his moving on in life.