Earlier quoted context omitted.
If you work in one of these (misguided) open-plan offices, ask you co-workers if the noise bothers them. Whatever they say, take your mechanical keyboard home and play with it there. There's no good reason to inflict that noise on your co-workers. They'll appreciate it even if they won't call you out on it.
I would do that, if they would not inflict their rambling speaker-phone conference calls on me. The root of the problem is trying to pack people into a room like sardines and expect them to get any work done. But forcing people to use substandard equipment doesn't help anything.
Retaliation and escalation aren't solutions. Conscientious self-noise-reduction sets the example for others & makes it easier to politely ask the loudies to take their noise pollution out of the common area.