From Webster's:
http://www.m-w.com/dictionary/Discrimination
Main Entry:
dis·crim·i·na·tion 
Pronunciation: dis-"kri-m&-'nA-sh&n
Function:
noun
1 a : the act of
discriminating b : the process by which two stimuli differing in some aspect are responded to differently
2 : the quality or power of finely distinguishing
3 a : the act, practice, or an instance of
discriminating categorically rather than individually
b : prejudiced or prejudicial outlook, action, or treatment <racial
discrimination>
Notice how the racial discrimination aspect comes third.
Read #1 - you can descriminate against peopel carrying alcohol. You can descriminate against people wearing oilers jerseys. I descriminate between small brewer's beer and the swill that is 'Blue'.
The two teired cab system affects cabbies, cab jockeys, dispatchers and passengers.
Allowing a two teired system affects us all.