... employees with STEM degrees have critical thinking skills *and* STEM degrees. Just sayin'.
Hrmmm. Just some random thoughts, as someone with a film degree that also codes and has a highly technical job -- I am a sound designer and a recording engineer. I will to some extent generalize, but that's what we're doing here.
1) I've noticed that people can have really extensive technical knowledge but really not have any concept of social context or even the social utility of what they do. Indeed they'll often argue that the social utility is meaningless when compared to some teleological "search for knowledge," which is portrayed as valueless and objectively good, and questions of economy and competing interests are morally inferior.
2) STEM people can be total philistines. They'll often deride art and creative pursuits as somehow less essential or necessary than the cause of science and progress. They don't seem to understand that "progress" itself is a moral concept deeply embedded within a complex philosophical value system, and indeed a lot of STEM people know nothing of philosophy or epistemology, and think the entire enterprise of philosophy is some sort of academic scam. I love me some Neil DeGrasse Tyson, but he's completely put the foot in his mouth on several occasions when he thinks he's talking about philosophy of science, and I loved the new Cosmos but his depictions of certain historical events, particularly about Giordano Bruno, were glib and lacked rigor or sensitive knowledge.
3) I've noticed that a lot of people with an engineering or medical background are subject to many forms of woo, quackery and crank ideas. Whenever someone prints a list of "scientists" who oppose Evolution/Global Warming/Old Universe, take your pick, the list is generally chock full of engineer Ph.Ds.
4) Relatedly, I've noticed a lot of engineers are dilettantes who tend to see all problems in the world as simply problems of applied computer science, who don't respect professional expertise or knowledge, or respect the fact that things in the world can fundamentally differ in kind from the problems of science and engineering.
5) Some STEM people can be highly dogmatic, if you ever get into an argument with one over some point they will not let go of, eventually they'll resort to some form of scientism, and insist that the thing you believe is false because its existence cannot be falsified. An important part of exposing yourself to art and creativity is acknowledging that you can't prove beauty exists falsifiably, and everyone can argue over wether this or that tulip is beautiful, but beauty exists.