Argument from Authority?

The following style of argument is sometimes found and is very annoying:

The scientists in this field say X.

Wait a moment… Here's a scientist in this field who says Y.

“I think that’s called argument by authority.”

Apparently, someone saying “Science proves my side right” isn’t using an argument from authority until he/she cites a specific scientist. This is the opposite of [CITATION NEEDED]. They might even explain why some people cite a “landmark study”, but can't be bothered to give you a reference.