I think you need something like this:
https://www.supplyhouse.com/Tubing-Insulators-1674000

Edit: Sorry I took the TLDR method of reading. These look to be more for horizontal application.

Edit2: How about these:
https://www.supplyhouse.com/Straight-through-Supports-583000

 

I thought those were just for cosmetic purposes when you had a piece of pex come up through a floor and it might be seen.

 

Not necessary.


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I drilled 1" holes under the stubouts that go through the 2x6 bottom plate and 3/4" plank subfloor. When running pex through these bored holes, are you supposed to protect the pipe from rubbing against the surrounding wood?

Not a plumber, but from my experience it's not really an issue. PEX won't get damaged by the wood and unlike copper it won't make noise if it rubs too tightly against the wood. Leave a little slack in your PEX line for expansion/contraction and you're fine.
I've never seen anyone do anything other than run the PEX through the hole and then throw on a nail protector on the outside of the stud if the pipe was within drywall screw range.
You can firestop the hole if it's between floors or in a spot that would require it.

 

There are sleeves for where it goes thru concrete, not for wood.

 

Those supports/protectors seem like they would definitely protect it, but also seem way overkill haha. I was hoping for like a thin tape or pipe wrap if rubbing was an issue, but based on responses, it looks like it's not a problem to just run the tubing through bare wood bore. One less thing to do!

 

As long as the hole size doesn't exceed specifications for the wooden member I drill the hole big enough such that the wrap around foam pipe insulation can slide through it.

That way the pipe is insulated, and protected, all in one step.