This can sometimes lead to burnout for me. When I blindly try to please no matter what, it also raises the bar of expectations. Sometimes people just want to feel superior and will take advantage, which can be hard to see in the moment.

As a follow on - my grandpa often said to "give each customer the best you have at that moment." Selling goods or giving attention, if every customer gets the best you have none will have reason to feel bad towards you.