Is it okay if this happens? I want to confront people who pick up their mobile orders.
Can you tell me more so I can believe you? Why are you upset with someone who does mobile orders?
They always get served faster than people who stand in line to order.
That is just how the business operates. It isn't really helpful to try and argue how a restaurant conducts their business with them. Next time you could always just make use of the mobile order if you wanted to.
I mean, don't you think it's unfair? I do.
It may be unfair, but it is not the customer's fault for simply using a service offered to them. Maybe you could instead ask them about it so you could make use of it yourself.