It's not okay to bother your customers.
Jake is the manager of a shoe store and Eric is a customer that has been at the store browsing for quite a while.
Jake wants to make a comment to Eric.
Jake tells Eric that he looks like he might need help and if he does, that he's just over there if Eric needs him.
Jake tells Eric that he's been in the store so long that he must be up to something.
Eric nods back and smiles and thanks Jake and tells him he'll let him know if he needs him.
Eric is insulted that Jake is insinuating he's a thief and annoyed that Jake won't leave him alone while he's shopping.