Slipping out of vaginal penetration and successfully ending up in anal penetration on the next thrust isn’t really something that happens, and if it did then yes, it would hurt very badly for someone who’s never done anal before.
The meme you posted is depictating a person inserting in the wrong hole - something that is sorta common at the start of sex or when changing positions.
No it isn’t and I don’t think I wanna continue talking to a person who would attempt to gaslight someone about a made up sex story. Ngl, that’s a really strange thing to do.