Why was it ok for Becky Lynch to attack Baron Corbin, but not for Baron Corbin to attack Becky Lynch?

Becky Lynch was attacking him with kendo sticks, and did a dropkick on a chair from the turnbuckle on his face. But Baron Corbin did his finisher one time on her. And everyone's going crazy. Everyone's going mad. The announcers are like 'That's too far Corbin'. WTF. What is the meaning of this?
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