Is it still self defense if your strike is stronger than your opponent's?

I was watching this clip.

https://youtu.be/DMkagjbwIPQ

On one hand I think the man is not wrong to hit back, on the other hand I think he is to blame in the sense he should not have hit that hard. Her strike wasn't nearly as strong as his, her being smaller would make it obvious she would not be able to hit like him. I doubt he felt so endagered that he had to throw such a punch. He knew she couldn't hurt him as much as he could hurt her.

And this is not only about men and women. If it was a smaller man in her place I would have thought the same. Same if she attacked a bigger woman with the same result. If a child hits you would you punch them as hard as he did hit her? We should be the smarter one, not lower ourselves to the stupidness of the attacker.
It is ok to hit back as long as you do not exagerate
Vote A
If you get hit you can hit back as you wish
Vote B
No, hitting a weaker person is never ok
Vote C
Other
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Is it still self defense if your strike is stronger than your opponent's?
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