WIBTAH for confronting my grandparents about boundaries?

Hello all! Long time viewer first time poster here~
As we all know thanksgiving was today and happy thanksgiving to everyone but let me get to the chase and make this as short as possible.

I (20F) of course celebrated thanksgiving with my family today as we normally do at my parent’s house. Pretty much every holiday and birthday is celebrated at my parents house with almost all of our close family/friends near by coming over including my grandparents.

To give some background, I love my grandparents I really do but they’ve always had this issue of pushing boundaries way too far with people especially with me and my siblings which I’ve always hated. For example I absolutely despise photos of me being taken. Mainly because I’m insecure about how I look in them and it’s so bad everyone barely has any photos of me aside of when I was a kid. But my grandparents always cross the line and try to sneak photos of me or hold me tight while one pulls out the camera and it honestly makes me want to cry sometimes because I hate it so much. I’ll take the occasional family
photos with everyone but when they do it randomly or hold me tight to do it i just hate it.

They also did that today with me but what makes me really made is how the treated my brother (16M). He’s a gamer and it’s practically all he does outside of school which I don’t care he’s happy and loves it and has also met some good friends there. But, he’s in there so often that my parents and grandparents call his room “his cave” and I hate it and so does he. But today they were especially pushy and kept poking fun at him saying “oh look he came out of his cave!”and all of this other stuff just pissing him off and seeing that pissed me off. He ended up not coming out for dessert even when i told him, didn’t say good byes to anyone, and i got new christmas decorations so i was excited and since everyone was here we did it today (don’t judge haha) and he didn’t come out for that either when i asked if he wanted to.

It honestly just broke my heart seeing that this is most likely because of them making fun of him cause that’s when it started and I want to talk to my parents and grandparents about it but they are fairly emotionally unavailable and think emotions are for babies including anger and my grandparents are pretty sensitive so I now they will be upset.
So… Would I be the asshole for asking them/confronting them to back off?
Sorry for this being so long but thank you all.