It does seem very misguided and will likely be the last nail in the Tories' coffin for this election. As you said, the target audience for such policies drifted towards Reform and other similar parties long ago.
For what it's worth, I do think there is an attitude problem in some young people, and that it's generally getting worse over time, to the detriment of society. But the answer isn't ill-advised government policies that take away your freedom and autonomy. Better parenting would be a good start, but that's not something you can legislate for.