i think you're getting discipline and bullying confused, they're very different things. discipline is of course necessary, but going through life walking on eggshells because you don't know exactly what is going to set your dad off but you know it's coming for one reason or another because he's clearly in a bad mood is not having a "tough dad", and does not make anybody better as a person.

in order to hold this opinion, you either have to not actually know what it's like to experience parental bullying, or you have to be in complete denial.