Why do people on the left incessantly refer to Latinos and Hispanic Americans as "brown people"?

I read over and over and over ad nauseam that Trump Supporters don’t want “brown people”. And they call us racist, when they are the ones coming up with labels and categories such as this.

Most Hispanics are very Caucasian, and we identify them as such. There are those who are classified as “Mestizo” which means they have Native American features / ancestry. But we do not consider Hispanic a race.

Most Americans whose families have been here more than 75 years have at least some Native Americans in their history. And probably some Latino as well.

Seriously, no one on the right categorizes race this way, or considers race a part of Latino culture.