not doing their duty of teaching their flock how to live the faith - how to dress, how the faithful should conduct themselves with those of the opposite sex, the parents obligations to teach that to their children, the parents obligations to teach their children work skills......
Today, in that sin of negligence, it is the complete opposite, their practically are no priests fulfilling their duty. Not a one. And I am speaking of the SSPX.
You also have to add the big limiting factor - the SSPX (and all independent chapels) are not parishes. No Trad Bishop/priest has jurisdictional authority over any layman. So, laymen aren't obligated to strict obedience, as in the past. Trad-land is the wild west. Priests can preach til they are blue in the face, but it's just a suggestion. In this regard, they have fulfilled their duty.
In pre-V2 times, bishops/priests had more authority, so their duty was also more elevated. Today, it's just a different story.