In America, anti-Catholic sentiment was extremely strong until relatively recently, and then only because religiosity (and thus the reason for it) has declined. All the theological division still exists, it’s just less striking in a world that’s much more irreligious and in countries where vastly different religions (Muslim or Hindu) are present now in real numbers.
Practically all the pro-Pope sentiment I’ve seen in my lifetime has been from various flavors of atheists, agnostics, and other areligious types. Catholics themselves generally hold more respect for the office than the person, and Protestants are almost uniformly negative on both.