That's great, but it doesn't mean anything. It obviously is your business because you've made a point to comment on this thread multiple times.
It's a lazy argument, dressed up as indifference. What you really mean to say is, because I don't find this particular thing offensive to me, it's eye rolling and annoying that other people do.
It's just ignorance and lack of empathy. I'd be more interested in why you're so keen on defending it if other people's lives are actually none of your business. Because it seems to be enough of your business to try and convince people that they shouldn't care.
I feel like it's more accurate to say that you don't care about the stereotypes portrayed because they have no impact on you, and therefore don't see it as a big deal. Even if they are a big deal to others, you lack the empathy or understanding of the context to care.
When this is noted, you try to make it about the fact that the racist images are on an object of clothing, so you deflect by saying you "don't care what people wear". This image is racist, it has nothing to do with the fact that it's on clothing. It could be on a poster, TV advert, whatever. Your opinion would still be the same because the crux of the matter is you don't care that it's offensive.