First day at work

Being a cashier isn't easy at all, no kidding. I had to help handle a customer who bought four whole trolleys of washing powder, cooking oil and the like. All imba heavy items. Some guy saw my visitor pass and asked whether I was there to visit or to work. Upon hearing that im an undergrad, he was rather shocked and said, "Undergrad still do this kinda work!" I had a very strong feeling that I was being despised. I shrugged it off, but I actually really wanted to slap him. I need money so I work hard for it, no need to look down on me thankyouverymuch. I also saw a customer THROW money onto the counter, with absolutely no respect for fellow human beings. Previously working as admin it was pretty much just my computer and me, now this job has really given me a taste of the real world. Total eye-opener!