Was that petty or what?

Long rant... but I feel better getting this off my chest. Were they being petty or am I just overreacting?

My boyfriend's son is supposed to live with his mother, but long story short, she practically abandoned him when she got a new boy toy and replaced him with that. So she since dumped him with her sister and mom. Of course meanwhile she still gets child support and doesn't work for a living... but anyways. We see his ex's family and do pick up/drop off with them and negotiate with them when my boyfriend wants to see his son. He gets along with them just fine, it's the ex. She's the black sheep of the family. And those words came out of her mom and sister's mouths! I'd say I have a good relationship with them too. They even let me pick up his son from them sometimes when he can't. I'm friends with the ex-sister in law on social media and stuff. And one day I come across the ex-mother in law's Instagram. Of course I just want to stay connect with them and see what his son is up to when he's not with us. I love his son like my own. Snooping on their social media isn't my intention for connecting with them. I'm above that. To continue, I request to follow the ex-MIL's IG. It was public and all that. Then within 15 mins later she blocked me and her profile is private. Just like that. My boyfriend didn't even know his ex-MIL had IG and requested to follow her too. But she didn't accept it. I told him her blocking me hurt my feelings and he brought up the situation to them when he picked his son up this morning from them. She said she had no idea what happened and that she isn't tech savvy and she must've done something wrong. Bullshit. Anyways, she said she would unblock me and accept both our requests. It's now almost tomorrow and I've been unblocked but both our requests haven't been approved like she said she would do. Meanwhile, her posts go from 1,140 when i first encountered her profile. I screenshot it to show my boyfriend his ex-MIL had IG. Now she's at 1070.... I think her blocking me and starting to delete posts was a petty move. I was just trying to be more connected to them and this is how she played it??

Thank for you reading :)