Whom are you providing service? Do your customers care about what language do you use? Will selection of a language make a difference in your customer's impress

Whom are you providing service? Do your customers care about what language do you use? Will selection of a language make a difference in your customer's impression or satisfaction? If not, then ignore what others say! They are are not your target market or stakeholders in your projects. Listening to them will only detract you for your main goals of having customer and having them satisfied.