Okay, then yes that's not normal. I'd never tell a candidate that they are just flat out wrong, that honestly seem unprofessional and kinda aggressive. I still

Okay, then yes that's not normal. I'd never tell a candidate that they are just flat out wrong, that honestly seem unprofessional and kinda aggressive. I still might say something like "So I'd go with MySQL here myself, can you guide me through your reasoning for picking another database system or which circumstances that might cause you to go with MySQL as well?".