My mom is afraid of birds and now I get why

From what I heard/was taught it's not the prevailing theory everywhere. Some researchers are adamant avian disnosaurs don't exist/don't count and call them something along the lines of "flying reptiles".

The current consensus, meaning that people that don't accept this notion are on the outside, is that birds are therapod dinosaurs. Any scientists that don't agree are the ones that have to look for proof. So while it's not extreme as someone saying the earth is flat, if a scientist disagrees, they are considered wrong until they can prove otherwise.