I keep seeing people saying things like Oh ill drink booze as my 20% or ill have that cake etc.

The main thing I take from the PB is avoid poisons.
Then for the 80/20 I take it more as, if you go out to a restaurant and the meal is cooked in some nasty oil, but its a good plate of meat and veg, you don't beat yourself up and just move on.
So aim for 100% but if there are situations where you can't avoid something, don't worry about it so much.

How do you see it?
Just curious, don't want to start a war