AITJ for commenting “ur so embarrassing lol” on my sisters post about her siblings?
My sister 26F made a post yesterday on instagram about our family and shared a picture of her with each of her siblings. The ones with my 29F sister and 24F sister were just normal currentish pictures of them together. I’m much younger than my siblings as I’m 15 and a boy the picture she chose for me was a picture she took when I was probably like 5 or 6 and it’s me sitting in her lap as we watched tv. Her part talking about me was “to my lovely baby brother, words can not describe how proud I am of the man you are becoming today and how talented you are in whatever you do. I love you more than you can even imagine” so when I saw the post and saw the picture she chose for me over what she chose for our other siblings I just commented “ur so embarrassing lol” and just went about my day, I later check the sibling group chat with everyone mad at me for what I commented saying our sister did something sweet and I just call her embarrassing and how it was rude. I don’t get it, it was a harmless playful comment. Am I just stupid or something?