Why boys (not all ) thinks this is too cool ?

One of my male friend, asked me out I just said no becz m usse bhai ki tarah dekhti hu but nhi bande ko samajh nhi aaya usse reason bhi de Diya when I said I will blocked u usne choda then phir subtle tarah se puchhta Isse bachne ke liye I told him I already had a bf (imaginary person and safer side mere dost ne ek fake id banai to mne vo bta diya uspe face nhi tha) then everytime he take discussion to sex or anything I always stops him and draw the line But vo bhi samajh koi aayegi, today he asked me about periods general knowledge I told him then he send me such pathetic reel i kindly message him to not to send this then the person audacity to ask me do u want to see dick of person of same age (bhai sharam h ya nhi even though I reply him but I need some good reply for these people)