Reform Jews’s view of orthodox

In my orthodox school in Israel, most rabbis (especially those who never visited the US) had a negative view of Reform Jews, ranging from “they are confused Jews” to “they are an existential threat to orthodox Judaism”.

I’ve never been to the US, but from my experience here on reddit I obviously realized it’s not true. Reform Jews are still Jews, just a different branch of Judaism.

However this got me thinking, what is the Reform view of Orthodox Jews?