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Suppressors in movies/shows tend to make the shot sound like a freaking laser blaster.  (At least the shows I watch)
You can argue over how quiet high-end silencers really can make a pistol, but I call BS on silencers turning pistol shots into freaking Star Wars laser blasts.
You've never used a suppressed gun of any kind have you? Because you completely forgot about the difference between sub and super rounds. >

I’ve seen videos where they shot 9mm rounds with a suppressor attached and it sounded like a weak punch against plywood. >

And do you know the type of ammo that was used? >

His source is he saw a video? Seriously? >

So suppressors can do two things. They can quiet a gun or simply just change the sound so it’s less recognizable. They are also great for making it more difficult to locate where a shit is coming from.
But they still are very loud. You would still want ear protection. And videos or just audio recordings in general do not truly record the intensity of either suppressed or insult Essex gun shots. >

Idk that scene in John Wick where they are in like a train station and just casually shooting at each other with suppressors and no one notices is pretty unrealistic >

That mostly due to the surreal world of the movie, where the Assassin world and normal world interact unconsciously and people on the outside barely pay attention to the assassin stuff happening around them. >

Don’t remember the exact type the person was talking about but I certainly didn’t hear any mention of sub-sonic rounds. 
Edit: hang on, I checked it out; hush 9mm 147g. Regardless of the ammo type I still think it’s irrelevant; if you get hit by one you are going down.