Dollar Tree review: Cashier - stating store policy

I made some purchases,!paid with my debit card & requested cash with the machine. When it went through, the cashier tells "I should have told her I wanted cash so she could see if she had the cash". I asked why do I have to tell her that. She said that's the store's policy. I then told the cashier if this is something new with Dollar Tree, they need to
" Post" this information before customers start their transactions OR the cashier should ask customers how they're paying and/or let customer know they have no cash if they intend to use their cards for that purpose.

i use debit cards and/or credit cards most of the time when purchasing anything and. never encountered anything like this.