Sub-Saharan Africa is the hardest since they'd been dealing with Arabs for centuries. The slave trade was a time-proven way of economic benefit, and it didn't matter who was doing it. Europeans had useful things to sell in any case, like tools, weapons, alcohol, etc., and all they asked was ivory, other tropical goods, and slaves. And you're just selling criminals, the dirt poor, and people captured in war to these people, and since you're getting rid of the worst people in society, why should you be hostile to the white man?
The Native Americans also have no reason to act like the Sentinelese. After all, there's people selling some nice, incredibly useful stuff at low prices. Why should they be hostile? And if they don't take advantage of it, others will, and that's not very good.
Now, I think it's plausible for people to get all anxious about European influence corrupting traditional society much sooner than OTL, but Europeans will still gain influence in the first place. I don't see a way of preventing them from gaining that foothold, since if the Europeans are rebuffed at one point along the East Coast, they can just try again at some other point. There's no way everyone is going to hostile against the white man.