Its a science but its actual experimental data (eg: real science) is a small fraction of the field and relatively new.

Also, much like other humanities sciences… There’s been the alarming discovery that much of what is taken for granted by earlier studies and applied at scale worldwide, is bunk - or at least very flawed. https://theconversation.com/the-replication-crisis-has-engulfed-economics-49202

So you can forgive people for being dismissive.