Why do people call all cocktails "martinis?"?

You know, I never thought of that until you mentioned it, and you are damn right.

I work in the industry. I only here martinis called martinis.

The people I know classify their drinks depending on content. If a cocktail is served in a martini glass and has an apple or chocalate flavor they will call it a “something or another” martini.

This likely stems from restaurant menus.

I have not experienced people calling all cocktails martinis.

Just to note.
The glass most people think of as “martini” is actually called a “cocktail glass”. There’s no such thing as a “martini glass”.

I don’t. I have not heard anyone do this either.