[nilkn]

In my opinion, if you know you're going to be working in an open office setting, you should try to be courteous and minimize the negative impact you have on your coworkers. I think you should be willing to make the choice to use a quieter keyboard that isn't necessarily your favorite.

So I'd say the problem is with both. The open office is the ultimate source of the issue, but it can be compounded by workers who make choices that exacerbate the situation. The reality is that an open office can be quite pleasant if the people working in it collectively make effective choices that take into account the well-being of the group.