If a guy touched your ass, can you slap him?

Let say your in a tight space perhaps in a scenario where exam results came out on a notice board and everyone is huddled very closely together looking for their results. Now, let say a guy is behind you and his hand passes against your butt or in fact is touching your butt for a long while.

If a guy touched your ass, can you slap him ?

Not so much like what is shown in the picture but like let say a few of his fingers or dorsal aspect of his hand is in fact making contact with your butt.

Do you have a right to slap him?
I can slap him
Nope. Do not slap.
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If a guy touched your ass, can you slap him?
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