With a linear switch like MX red, there are only three sources of noise: bottom-out, upstroke, and slider friction (I'm not counting stabilizer rattle). If you aren't bottoming out, then you won't get bottom out noise. Slider friction doesn't make a ping noise, it makes a shuff sound. The only thing left is upstroke noise, when the slider hits the underside of the switch housing. I've never heard that described as a "ping", but whatever. An MX silent red switch has very little upstroke noise. Like I mentioned earlier, most of the noise comes from slider friction, and it isn't a sharp "ping" at all.
BTW, I've never encountered a switch that is 100% silent. Pursuit of such is a fool's errand, IMO.