AITA for calling my step mom "druggie" because she won't stop using a nickname she gave me as a baby

AIT ta for calling my stepmom druggie because she won't stop using a nickname she gave me as a baby my stepmother has always been a part of my life she was my mom's best friend and she later went on to get with my father and pop out six kids her and my mom stopped being friends at that point but anyways she gave me some nicknames that I have always hated with a passion piggy Porky chunka chuny Etc basically a ton of nicknames referring to me being a fat I went very little contact with her and

my father at the age of 10 when she picked me up from a school dance and decided to yell across the yard there's my Piggy and I was bullied from that point forward by the students that Hur it and was subjected to that stupid nickname all through school until I finally convinced my mom to switch school districts when I was 15 I'm currently 32 F and this nickname still haunts me I developed a severe eating disorder and dropped down to 89 lbs by the time I was in 10th Grade and my stepmother knows this but

refuses to believe it was because of her nickname for me that I was getting bullied so like I said I went very little contact with her and my father 22 years ago I only saw them maybe once a year from that point forward and as I've gotten older it's far less than that I hadn't seen my stepmother in nearly four years and hadn't seen my father for three but my brothers 19yo twins boot camp graduation ceremony was on Saturday and of course I went as soon as I got there my stepmother started in with the

nickname again I told her firmly to stop and she literally laughed and said but you'll always be my piggy so I said I haven't been fat since I was 10 and she says yeah but you were and I loved you anyways you were so cute so I started referring to her as druggie she was a drug addict up until maybe 6 years ago Pill Popper loved her clopin she said that wasn't funny that I took it too far so I said why you were a druggy and I loved you anyways she immediately got up and

left missing my brothers her sons ceremony my dad says I'm a a and that what I did was in no way Justified because it's not even up for a fair comparison AIT