No, Walmart is kind of an outlier by having a greeter. In other places that have a “greeter” it’s usually an extra layer of security/theft prevention, or it’s a place like Costco where you need a membership to shop there. That said, it’s basically standard for an employee to seek you out and ask if you would like help finding anything fairly soon after you walk in the store. It’s generally seen as good customer service, and in larger stores it’s not uncommon to be approached by several employees asking if you’d like help finding what you’re looking for over the course of your time in the store.

American customer service culture tends to be a little extra. There’s a premium on going the extra mile that’s tied into America’s self-image of the “land of opportunity,” and the hustle culture that goes with that. But when that’s what you’re accustomed to dealing with, the customer service cultures of other countries can be kind of jarring. I know from my own travels through Europe that shopping in some countries can range from feeling cold and indifferent, to feeling actively hostile.

That said, most Americans wouldn’t think of complaining to your manager about it. It’s only a specific kind of over-entitled asshole that does that. Sounds like you had a real karen on your hands.