AITA for yelling at my brother over a sticker?

Background:

Last year, my (20F) parents gifted me a 350 CC cruiser. It was a surprise: my father took me to the showroom to look at the bikes "for a friend" (and no I didn't get suspicious, I'm not that smart when it comes to these things), and a few weeks later, it was on our doorstep. Since it was a surprise, they hadn't consulted me about the customisations, so I ended up with a small front visor with the sticker of a flower. The specific flower was the literal meaning of my name in Persian language. I didn't exactly like the visor(I would've preferred a long visor or no visor at all), but the flower was actually sweet, so I just ignored it. My brother (25) really hated the flower, and always complained about it whenever he had to borrow my bike, but I ignored it.

Anyway, last week, I decided to just take the visor off with the sticker intact and just keep it. The sticker was a nice thoughtful touch by my mother (she calls me her <the flower> a lot, my contact is saved in her phone as the flower etc). I'm currently in the middle of board exams, so I was planning to do it literally TOMORROW.

This morning, my brother had to borrow my bike (I didn't mind). Around noon, my mother calls to ask why I let my brother take the sticker off. (I didn't?) So when he called a few minutes ago to ask my mother about some client, I yelled at him and he just asked me to leave it. AITA?

Edit:

Just wanted to make it clear that I kinda disliked the sticker, but loved the thought that went behind it. I'm not good at expressing my feelings, but I hope it's clear what I mean by that?