They jumped in to defend themselves. That's what happens when you attack them. If you attack the thing and not the people, they don't get so defensive.
No one attacked anyone. OP asked how many of you were cool with this image. All you have to do is say "actually no, that image is fucked up" and suddenly you're not under attack. In order to interpret this post as anything remotely similar to an attack on your character, you have to first decide that you're cool with racism.
You didn't attack racism. You attacked people because there was racism nearby. Anyone who asked for an explanation was then called racist. You attacked people personally.
Not really. It wasn't really a possibility until you came along. I'm just going to do something more productive with my time than talking to you. It'll be good for me, mentally.