I brought in my own mechanical keyboard to the office. It has clicky keys so it's not quiet. I haven't gotten any complaints yet, but that could change depending on who my next cubicle neighbor might be.
You are otherwise reinforcing the point that you can't just bring whatever equipment you want to the office, as the parent poster claimed.
I am reinforcing no such point. I bring my own keyboard but it isn't noisy. I also bring my own mouse.