Can the Hui people be regarded as descendants of the Yellow Emperor?

It is true that the Hui people are not necessarily after the Yellow Emperor, but it is not absolute. Hui people immigrated from Iran, Xinjiang and even Palestine, but some Han people joined the Hui people. For example, most women married by Han people will become Muslims and will not marry outside. So your classmates are not definitely not descendants of the Chinese people, but descendants of the Chinese people.