No, didn't upset me at all. We did what we had to do at the time.
It angered him. No doubt about it. But so did restraining him when he was trying to bite and kick and throw himself down the stairs.
Children are upset and scared when their parents spank them I am sure. I'd never consider hitting because I think it's brutal. But millions of parents hit their children as discipline. I got my dad's belt once!
Ignoring a child could also be seen as abusive, withdrawal of attention and acting like the child isn't there - how do we think the child feels about that when they are begging mummy mummy mummy and the mother turns her back?
Naughty step? Forced to sit on a step while a parent looms over you? Pushed back down again when you try to stand?
When you think about it, any and all methods of discipline are 'cruel' to the child and cause bad feelings in them. But what can you do with a child you can't reason with at all? be it toddler, or any age but just doesn't give a shit?
It wasn't pleasant I'll be honest. I would have given anything to have been able to sit them down and say "look, what you've just done has made me feel sad" and have them say "sorry mummy, I won't do that again." but that was not to be. And biting = sound I hate worked. The alternative was what? let them bite? They'd still be biting now! hit them? put them in their room and hold the door shut? Tell them no and have them bite again before I'd finished saying no?
I would have LOVED to have found a different way. I tried everything. None of the 'experts' I asked to help me could come up with anything that worked! Nothing. Not the paed, not the early years advisory team, nobody.
I look at my kids now, talking, in mainstream, calm (ish), ds1 even shows empathy!!! I think back to the child he was and I think whatever we did, it did help him to learn the rules. We found something when nothing else worked.
I have to say that while I understand your pov, I find the hoover used at that time when nothing else bothered him was no more 'cruel' than a spanking, the withdrawal of attention or the naughty step.