Had the same thing happen in Las Vegas with United.
Travelling with United to Chicago and then bmi to MAN in PE on a single voucher was sent to the Business check in at LAS by the triage person as the C check in had no queue (line).
Check in agent went loopy. Let her finish he rant then pointed out that her colleague had sent me over to her!
Just last week in Tesco in the line for the self serve check outs was told by Tesco "Here to Help" lady to go to the 10 items or less checkout as it was empty: lady there proceeded to count the items and loudly inform me that I shouldn't be using that particular check out as I had more than 10 items. I summoned her "Here to help" chum and invited her to tell her what she had just told me.
Can't see that either causes a huge problem if an employee is trying to cut down on waiting time.