Why does my ex always blame me for our kids’ stupid decisions and acts like she is the better parent than me?

Our kids’ are in their 20’s and my son has severe ADHD and unfortunately he makes dumb decisions, My ex acts like his stupid decisions are my fault , she never takes accountability for the way our kids’ turned out , she makes remarks like I wish you were a better father , i wish you guided our kids’ more and then she compares me to other Dad’s and says shit like he wouldn’t let his kid do this or do that blah blah blah , I try to keep myself under control but at times I will snap out at her and tell her to look in the fucking mirror , because our kids’ do respect me and love me , so why do you make me out to be this bad father? Like what is her deal, I don’t bash her or blame her for the kids’ behaviors, and decisions , they are adults now , so I just walk away , cuz i know it’s going to escalate onto more. Once I calm down, i will talk to her and tell her to please stop trying to put the kids’ against me, She just says it’s fine it’s fine. But she doesn’t hear a word I say. Unfortunately my ex and I still live together and I try to keep the peace as much as possible , we agreed to living together until the kids’ are on their own 2 feet and then we are going to sell the house and go our separate ways. My ex is a very selfish person and that’s why our marriage turned to shit , she met a toxic girlfriend that my gut knows they are up to no good together , Her girlfriend buys her expensive gifts and pays for their trips together her friendship with this girl is very weird to me because she doesn’t act this way with her other friends’ . They are going on a trip together in a few weeks , that her girlfriend paid for , I told her have a good time and left it at that. I plan on having a good time as well when she is gone. I am also thinking of ways I can kick her out of this house when she goes away so she can’t come back. Any suggestions?
Why does my ex always blame me for our kids’ stupid decisions and acts like she is the better parent than me?
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