Even worse when a version is actually different. I had to check the US prices in a store once, it decided “nah mate, your IP’s not American, clearly you’re a bloody idiot, here’s your native version” and even when I manually changed the url to US English, as they did languages based on part of the path, it still decided clearly I must not know what I want. I couldn’t even try to infer the price, as the product didn’t exist on my version of the site.

And aside from that and language pet peeves, what if you’re on Holiday? Or live in an area that speaks a lot of languages close together?

As Cousin Mose said, the language is in the header, the fact that some web devs decide the IP address is clearly a better way to figure out what language you want is insane