I got in trouble at school for going on instagram?

at school we have around 30 ipads, and we can pretty much use them whenever we want if we re finished our work. It was lunch so I took one and I saw the instagram app was installed. So I went on my account and I showed people pictures of my 2 lizards. I logged out and then me and my friend started lightly arguing about if jb shaved his head (not totally shaved) and I went on instagram (on the web, not the app) and showed her. At the end of the next day, the teacher came up to me and asked me why I went on instagram, and she said how she was setting up the instagram app and my name was there and stuff. And like I was so confused because everyone goes on instagram at my school. Then, my French teacher comes in and my teacher starts telling her about it. And the funny thing is, this French teacher is really inappropriate. She says sh*t in class and one time these boys where talking about milking or something and she was like "you re not gonna get any milk outta those boobs!" Like wtf. And these boys are always saying disgusting things and she laughs with them but I go on instagram and I get in trouble? Do you think this is fair? Should I have gotten in trouble? I m moving next year to thankfully I don t have to deal with this stuff anymore, but I just find it so annoying that these teachers are ready to yell at me for throwing a flower at someone (that happened in 4th grade, and it was like full out screaming at me)

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