In recent independent tests it took several days submerged in various oils/water/solvents to kill even a few primers out of large batches of several brands. They are infact much more resilient to those things than they were 'back in the day'.
IMHO most FTFs that are blamed on a 'bad' primer are in fact poor headspacing/size die setup or due to not seating the primer correctly.
I've had two in 37 years of handloading. Both were not doubt my fault.

I have never had a dud primer. I have however occasionally not seated a primer deep enough in to the primer pocket. When you do this the cup that gets dented by the primer actually compresses the charge between the anvil in the primer cup. If the primer is not seated against the bottom of the primer pocket the firing pin will dent the primer cup some, but the primer moves forward in the pocket and the anvil does not squeeze the high brisance charge.

Usually rechambering the same round will then set it off if the firing pin drives the primer deep enough into the primer pocket. This is another reason to thoroughly clean out the primer pocket. Some times the left over debris will prevent the primer from being seated to the bottom of the pocket. I usually feel the primer with my finger after seating it to make sure it is below the rim of the case which tells me it is deep enough for detonation.

The primer was completely dented in my the firing pin. There was no mistaking this primer was hit as hard as a pin could hit it. I then put the cartridge back in and shot again. Still nothing. Now the firing pin has such a dent it's almost like a nail went through it. It's definitely the primer.

I also check every primer to make sure it's seated right.