The context of the scene is important here. When seeing the Don they all had to leave their weapons behind. By picking up a chair Aerith was just improvising with what was in the room. And it was also a joke presumably referencing popular wrestling entertainment like WWE. Aerith’s actions here subverts the expectations of the audience of how a person like Aerith should fight. The scene became a popular meme for this reason.For example, Aerith in FF7 remake can take down a man with a chair but it may not unnecessary. I propose that it would be better if she is possessed by a mysterious voice to fight well like the man in the movie "Upgrade" (in the clip). Imagine if she fights some guys with her rod until a man uses a knife on her, she disarms it then counter-attack but still says: "I am sorry, sooo sorry..." while the man screams like way of Cloud with Madam M. Just kidding. But if this thing come true, the gamer will feel funny even the scene will be brutal.