But then you're not constantly engaging with the others in your bullpen!

I first read that as "non-acoustic people"

Exactly.

While reading the replies, I was hoping someone would make that analogy.

tuning out noise is a skill that your brain has to learn, and that’s why the health organizations recommend it limiting your time on noise cancelling headphones.

Is it different for people with autism?

The other commenter already responded to this point, but I wanted to stress the difficulty we have with this. I'd argue that differences in filtering out stimuli is a key component of autism - not just for sounds, but for all variety of inputs. Lights, tactile sensations, tastes and smells, they can seem "dialed up to 11" (or turned down to 1) for a lot of us. No two autistic people are the same, however, and my sensory experiences can be drastically different from another's. It's all about how the stimuli is handled in the brain.

Typically, human brains filter out a lot of information. Take the example of "can you feel the chair you're sitting in?" Now that you're thinking about it, you probably can. But before it was mentioned, were you aware? Did you feel the way the wood, plastic, or cushion pushed against your body? For an autistic individual, they may be acutely aware of those sensations before having them pointed out. How about your clothes? Are you wearing long sleeves, feeling the fabric against your arms? Some of us feel it constantly, to the point that some of us avoid long sleeves because of it. Or socks? I think I feel my feet sandwiched into socks moreso than most people do. Fuzzy socks aren't fun for me - they're distracting.

The experience can change based on other factors. Most days I can tolerate sunlight, though I prefer to wear my sunglasses. Rarely, there are days where light gives me such bad headaches that I need to wear sunglasses inside and/or turn lights off. Stress, general health, energy levels, and more can impact such experiences.

As to recommendations for one's health, you might consider us the canaries in the coal mine. If we find an environment too overwhelming, it might be taxing your brain too - you just don't feel it as immediately as we might.

I have heard that for non-autistic people anyway, tuning out noise is a skill that your brain has to learn, and that's why the health organizations recommend it limiting your time on noise cancelling headphones.

Is it different for people with autism?

Yes. The inability to filter out noise is a common experience with autism. This is one of the reasons people might wear noise cancelling headphones.

In a noisy environment, many autistic people say it is difficult to hear what’s being said. Background noises can create overwhelming listening difficulties. Conversations can become a jumble of words (as shown in the image below, created by the authors).

https://evidence.nihr.ac.uk/alert/better-understanding-of-autistic-peoples-listening-difficulties-could-improve-their-wellbeing/

I personally use ear plugs or head phones that are not powered on to filter out noises so I can focus on conversation.

So, I'm in my 40s, and have never really used noise cancellation. My brain has had all of the time in the world to learn how to do this. Instead, it chooses to amplify and focus on background noise.

Having a conversation in a noisy public space is literally just me doing my best to guess what you are saying at any given time. All I hear is a loud hiss of crowd noise.