If you are into memes and hang out at edgy racist places then you probably have seen it being used in such a way. Same with black people can't swim or any other racist nonsense. But it's not a stereotype people who are not into online culture are aware of. I am from germany and I have never heard of it growing up nor do I think other germans know of it.My cousins in Norway know about the watermelon stereotype, and so do my friends in England. It's not a stereotype localized in America that isn't known or understood overseas. This entire argument is similar to people who bring out Bananas only being a negative stereotype for black people in America, which is demonstrably untrue going by Fifa.
I educated myself on race issues so I know of it through that, but culturally there is 0 awareness outside of the anglosphere.