People love to talk about themselves and what they're doing. I don't think there's any barrier; if you know the right way to approach these conversations, they'll dump ideas on you.

I believe it might be selection bias. Founders who are building things are not joining networking events. I tend to avoid co-working spaces too ever since I realized it's full of the people I block on Facebook.

There's people who bounce ideas, and then there's some form of idea tire kicking. They talk about how vibe code is the future and going to change how we live and work, but they have never downloaded an AI IDE. These people are there to kick ideas around all day and they'll pay for a co-working space so they can kick their ideas at strangers and ignore all feedback. It's exhausting and it's possible that you might be viewed as one of those people.