They're not. They're viewed by contempt by techies with overinflated egos who don't realize that when looking at complex systems outside their area of expertise they're like junior developers coming into a legacy project guffawing at the needless complexity because they don't yet grasp the unwritten requirements that created the scar tissue they see as bad craftmanship.
Actual "real scientists" and "real engineers" understand that the social sciences are amongst the most complex of sciences because they don't have the liberty to run isolated experiments in a vacuum, run simulations and test assumptions with a pen and paper because their field of study encompasses the complexity of the entire human brain and its interaction with everything around us.
Sure, there are thousands and possibly millions of hacks in those fields but there are also thousands and millions of hacks in STEM. Imagine having your entire field judged on the musings and performance of the worst techie you know.
...I think that says more about you than me.