If you believe someone is actively harming the audience (as he seems to), a peaceful protest is the way to go.

We'll learn soon enough if he is right and the community stands (sits?) with him or not.

But I couldn't not giggle on "freedom to hear someone talk" as an inverse of "free speech". Jack Dorsey has many platforms where he is welcome, and there are plenty opportunities to hear him share his thoughts. It's not like someone on the fringes is being shut off.

He's not "violating" someone's freedom to listen to a talk, but rather he hates the guy and wants him gone. At least he's doing something about it