The vast majority of Spanish-speaking Latinos I interact with in my daily life as a server and student speak English very fluently but prefer to speak Spanish amongst their family and friends. I speak French pretty well but if I am in a Francophone nation I would speak English to my friends and family since I'm most comfortable with it and I don't have to switch my brain's internal language.

Even in the event I do serve someone who does not speak English very well, they usually have a child, spouse, or sibling who is willing to translate for them. I really fail to see an issue here.