Is this really that upsetting to you that you are forced to show documentation that you are at the very least somewhat competent with a firearm..........?
For "somewhat competent with a firearm" substitute:
...literate enough to vote? (Literacy tests used for voter discrimination)
... have enough income to able to afford to vote? (Poll tax used for voter discrimination)
A government mandated class is the same idea, it just affects a different civil right.
Once the government sets "minimum standards" there is nothing that keeps them from changing the standards to disenfranchise (voting) or disarm (gun rights) different groups of people.
The costs involved from mandated training and permiting are another barrier to entry. The training tuition and then the permit application can add up to a substanial amount. The right to self defense should not be limited to those who can afford to pay for the government mandated scheme.