Should Passengers be made to enter in passenger count before ordering?

I am tired of going to pick up passengers who are trying to fit 5 people into my uberX car. I won't accept these groups and they always get mad when I turn them down. Uber should make the rider enter in the number of passengers and if its above 4 prompt them to take an UberXL. I would hope with a feature like this at least the passengers will be expecting us X drivers to turn down their groups.