I took it to mean that no manager ever thanked them. Because, like sibling comments, I can’t believe no one like myself and siblings ordered a burger and said “

I took it to mean that no manager ever thanked them. Because, like sibling comments, I can’t believe no one like myself and siblings ordered a burger and said “thank you”. Hundreds of customers at that counter everyday, someone had to have uttered those words. But management, OTOH… (Alternatively, “no one” being defined as “the vast, vast majority of customers”. That I could believe.)