That is very critical, since you are neglecting something which your ancestors developed hundred of years, and this should be forgotten at once. This is not correct. How boring would this planet be if there would not be the variety of languages and peoples. Nationalism and patriotism is not the same since nationalism strives to the superiority of the nation over others. No nation has the right to threaten others or annex them.
Racism is a very serious problem.
It is a result of the materialistic system, which basis on superficiality and competition. Losers often seek to attack weaker only to demonstrate their strength. Racist are normally people with little intellect and understanding, they mistolerate what they do not understand or what is not like them. Anyways judging by outer looks is brainless anyway. Everybody does it, the stars in movie, the parents, the teachers etc.