Blue switches are definitely some of the loudest out there, so your partner’s teasing sounds pretty relatable! If you want to keep that satisfying click but tone it down a bit, I’d recommend trying some thin O-rings on the keycaps first. They don’t kill the click entirely but soften the bottom-out noise without messing with the tactile bump. I did that on my clicky keyboard, and it helped a lot without losing the feel. Lubricating the switches can also smooth out the action and reduce some noise, but it’s a bit more involved and might dull the click you love. Since you already tried a desk mat with minimal success, combining O-rings with a thicker mat or even a foam layer inside the case could make a noticeable difference. If it gets too quiet, you can always remove the rings later. It’s a good middle ground before jumping to a quieter switch altogether.