No - being resistant doesn't mean you can't use it at all, just not very well.
So you need to add enough supplemental insulin, so that despite a level of "resistance" you have enough extra to actually get the job done.
While a non-diabetic might need 10 units (produced by their own pancreas) to metabolize lunch, if you are so resistant that you need 30 units to get the same effect (resist using 20 of that 30 units) then you supplement.
Happy today about celebrating the birth of Our Lord; going to Midnight Mass. Tomorrow going to sister-in-law's family for dinner. First time that I have ever met her family.
Ok ✅ Ty
Then your resistance is obviously "not that bad" and you are still probably producing a decent amount of insulin yourself.
So I use only four units and it really makes a difference