It’s a well worn trope/meme that STEM majors hold Social Science and Humanities majors in contempt. My pet theory: STEM people are asking questions with definitive, verifiable answers. The fact the SS/H folks are asking more open ended questions with no “correct” answer frustrates them.
No. The reason is that the majority of STEM people can do well in humanities and social sciences but the converse isn’t true. Some fields in STEM are just incredibly hard. For example, vast majority of physics PhD’s don’t fully understand the quantum theories.