“When Mexico sends its people, they’re not sending their best, they’re not sending you. They’re not sending you. They’re sending people that have lots of problems, and they’re bringing those problems with us. They’re bringing drugs. They’re bringing crime. They’re rapists. And some, I assume, are good people.” - Donald Trump, 2015
If for instance you were from Mexico, it could be discouraging to attend the presentation of someone who believes that your ethnicity implies you are, most likely, a criminal.
I personally wouldn't ask a question to someone who believes I am a rapist based on my ethnicity. Would you?