Is it a double standard that you can't ever hit your parents but they can?

Over the years, I've noticed this reaction:

You're either in your late teens or an adult. You get into an argument with a parent, words are exchanged and your parents slaps you hard.

People's reaction: ''Oh you should've never spoken that way, disrespected your parent, you deserved it''.

You're upset at that moment, forget for a second it's your parent and slap back.

Pikachu reaction from the parent and people: ''Omg, how could you, that was your mother/father, you never ever hit your parent no matter if they slap you, just suck it up''.

I actually see two wrongs there, not one. Why would it ever be exception to strike anyone in anger just because of words? If it's not ok to strike your boss at work nor your spouse, then same thing should apply too.

Isn't that an example of a double standard?

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**Why would it ever be acceptable to strike anyone in anger just because of words?
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Granted that hitting back wasn't right either (I would walked away), you're putting yourself at risk of getting hit back by hitting first.
Is it a double standard that you can't ever hit your parents but they can?
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