This is empirical, not just a difference of opinion.
I worked in open offices that didn't bother me. Generally large companies with more than 60 employees. The noise becomes an indistinguishable background sound and long conversations are almost non-existent.
It's the smaller ones that annoy me. Those with 10 to 15 people. Conversations are easy to hear and understand, so your brain picks up on them. Since it's small, it turns into a bunch of little friend groups who have constant conversations.
...
Describing it just now, I notice that I am describing a high school class versus a university class. That's exactly how they feel. It only takes one or two disruptive agents to ruin everything.
Well, not until we either put on our maximum NR headphones and play our music at hearing-destroying levels. Maybe by the time we are completely and totally deaf, we will be able to tune it out.
That is exactly what I told my boss when they introduced our new open office and they said "works fine for me".
It goes both ways.
What I never even want to imagine is having to go work in a office where then I have to feel lonely. That's the worst of both worlds.