walking down Sheffield town centre with my nan

>she's old and can walk fine but I'm still making sure she doesn't trip
>300lb bitch appears on a mobility scooter, heading towards us
>we are on the left hand side, taking up 1/3 of the footpath
>bitch decides to continue scooting in the middle of the footpath, guaranteed collision
>her face has that "I ain't moving, you move, I AM A BEAUTIFUL STRONG BLACK WOMAN WHO DON'T NEED NO MAN" look
>nah I'm good thanks
>she brushes against me and topples over onto her side
>screams "OW! You knocked me you should have moved you jerk you freak etc"
>reply "lose weight" and walk off