Clothing gets you negative comments. iMessage gets people to exclude you from group chats or even text messaging completely. It's become far more socially acceptable to isolate someone because of what they don't own.
Even if this were the same level of bullying, the amount of resources that Apple needs to fix this is negligible compared to clothing companies or whathaveyou. You can't update a shirt. You can easily update the color of a bubble or implement an industry standard. Apple refuses to even try to fix this issue, and in my eyes, they're 100% complicit in enabling bullying.