Told my 13yrd son if I ever hear of him making fun of girl because she strayed a period I would beat his but am I wrong?

My son has started sex ed and been having a lot of period questions right now I have gone over and explained everything to him and told him when I was in high school I bled through my clothes and got made fun of and it hurt my feelings now this is not a true story but I told him if others are making fun he should stand up for her and never join in or I will beat him ( no I don't beat him) but said it to get my point across buy grandma thinks I went to far whay do you think? I'm trying to raise a respectful man.

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