What is wrong with my inlaws

To start off I've been active in my stepsons life for 6 years, we have shared custody if not have him most of the time. My partner is a great dad, he pays his child support, he's always active in his sons life, he helps out his sons mom whenever she needs (extra money, appointments, driving her places especially when she lost her car, providing extras) I know that's what a dad should do and everything and he doesn't deserve a gold star but my point is, he's active and strives for what's best for his son. I've always pushed him to co parent with his ex because he never used to. When her car broke down, I pushed him to offer car rides because that's his sons mom and he needs to want her to succeed and set a good example for my stepson. I've always been polite to her, I even baby sat her other child. She's bitter though, always been nasty in secret and recently she's made it apparent to my stepson. She's came at me multiple times, after I watched my stepson for two entire months because he was doing online school and I was able to be home for him and she needed the help, I did it no questions asked then when she picks him up she runs at me loosing it! She's called fax on me like 10 times, saying i abuse and neglect my stepson and my daughter. A few months ago fax actually called me in regards to the allegations, no problem. My house is suitable for my kids, they're fed, happy, cared for with all the love they can get. I'm not physical nor am I even verbal. I'm stern at times, I do punishments which include timeout, toys/electronics confiscated and the worst short term grounding and that's if it's needed. I'm very involved in my kids lives, I do hands on activities all the time ( nature walks, arts and crafts, science experiments) I'm not saying I'm a perfect parent, I'm just saying I'm not a parent that needs her kids taken away. Anyways, I've never had a good relationship with my inlaws and I try to keep my distance, never complain about the shitty things they do. My SIL is a narcissistic asshole. We got into it in the summer and I cut ties with her for good reason. When we stopped talking she befriended my stepsons mom and now they have a hate group about me.

I seen my SIL a few weeks ago, my daughter scratched her cheek while at my SILS, coincidentally it was when I was taking a work call in the other room so I have no idea what happened. My daughter wasn't bothered and I just left it. I find out she posted a video of my daughter and she like zoomed in on the cut and I seen my stepsons mom like the video on Facebook... I messaged my SIL and told her to not post pictures of me and my daughter. She has full rights to be friends with my stepsons mom but due to the constant issues, I don't want her to get amo as there's been times she sent my partner pictures of common kid, knee bruises and said it was being reported to fax but here's the thing, it wasn't just my stepson it was of my daughter too! She was two at the time, of course she got a few bruises running into stuff. She's a toddler and she's wild! My SIL responded with attitude and basically said go fuck yourself. Fast forward to Christmas, we go to my MIls and she's there, I got her her husband and my niece tons of gifts. They were rude about it and ungrateful, they got everyone gifts but me. Whatever. She was making jokes with my Bils sister saying I'm going to take tons of pictures of my daughter, so immature. Then proceeded to tell my niece, who I've been actively involved in her life that I'm not her aunt anymore and kept her away from me. My SIL and BILS sister were going on about my SIL showing her videos of my dad sunbathing at the trailer in the summer and he had no shirt and gut out.... she like secretly records stuff. My dad was there and he was so embarrassed! The who time was a shit show, if ruined my Christmas! I'm so done with them, my partner doesn't stand up for me either! He says he hates drama but I'm just over it. How can people be so shitty!