I'd add that it's not only the extreme polarisation, but also a muddying of terms that have different meanings or uses between the US and Europe (at least my part of Europe).
I sometimes hear people conflating "the left" and "liberals" when... the left is here opposed to liberalism. Because liberalism means economic liberalism. And the local economic liberals are socially conservative. While the left is economically illiberal, and socially progressive. And our centrists are probably the closest thing we have to the US left, but since they are mostly allied with the right opposing them makes no sense.
The real problem is that in the US, we measure everything with a single yardstick that goes from "Left" to "Right".
But the actual, real reality is that 80%+ of people can't be measured in such a one-dimensional way. People have more nuance than that, and to get even a remotely accurate sense of where someone is politically requires a multipolar yardstick.
I sometimes hear people conflating "the left" and "liberals" when... the left is here opposed to liberalism. Because liberalism means economic liberalism. And the local economic liberals are socially conservative. While the left is economically illiberal, and socially progressive. And our centrists are probably the closest thing we have to the US left, but since they are mostly allied with the right opposing them makes no sense.