Because racism is not only the color of the skin or religion,
rac·ism
ˈrāˌsizəm/Submit
noun
prejudice, discrimination, or antagonism directed against someone of a different race based on the belief that one's own race is superior.
"a program to combat racism"
synonyms: racial discrimination, racialism, racial prejudice, xenophobia, chauvinism, bigotry, casteism
"Aborigines are the main victims of racism in Australia"
the belief that all members of each race possess characteristics or abilities specific to that race, especially so as to distinguish it as inferior or superior to another race or races.
noun: racism
"theories of racism"
What you mean instead is discriminatory. Not my opinion but definitely makes more sense than racism.
This is a public forum and people can say and do as they please which includes telling you their opinion of you. Not everyone has to help people or hold their hands as they learn.
To some degree I understand where you are coming from, but ignorance is no excuse IMO. This whole situation appears to have been a clusterf**k, and I don't think your scrambling helped anything. So now that you realize the mistakes you made along the way I would suggest just moving on. For what it's worth your trust score shows as neutral to me, so there is no immediate repercussions and you will just have to have a conversation with anyone who questions it in the future.