Microaggression

I had experience and witness microaggression when I was young.  I heard of people asking me about "where are you from" and "where were I born." I feel like people should not judge by someone's background or whether if someone first language was not English. I had heard people saying that my English wasn't good since it was my second language. I had heard many people saying about "you are Asian, then you must be good at math." I feel like that is not true because everyone has a talent in certain thing. One could be good at math and another could be good at English. Another example of microaggression I had witness was when I was walking home and  someone saying "that black smells" and move away from the person.  I feel like that is very disrespectful and racist.