Still, when talking about a "Liberal Arts education," you're talking about a generalized and broad education in a variety of topics, including subjects related to math and science. That's what the term means. No, that doesn't mean that you will study literally every subject, but it's not claiming to be about any particular subject. STEM, meanwhile, seems to be trying to claim to be a valid classification of a particular type of study, distinct from that kind of "broad, well rounded education."
If you say you want to get a Liberal Arts degree, you're telling me, "I'm not going to college for job training in a specific career. I'm going for a general education." If you say you want to get a BS in CompSci, you're basically telling me, "I'm going to college to get training for a career in software development," or something along those lines. Already that's kind of vague, because there are a number of different career paths that involve computer science, and computer science is already a fairly broad field. But if you tell me, "I want a STEM degree," you're telling me, "I have no idea why I'm going to school. I guess I want an education in sciencey stuff that will focus in on a particular field for career training, but I don't actually have any understanding of what field I want to study."
I'm struggling to come up with a good analogy, but it's like if you said, "I really want to travel!" and I asked, "Are you just interested in travelling generally and seeing the world? Or is there a particular place that you want to go?" and you respond, "No, there's a very specific place that I want to go."
So then I ask, "Where's that?" and you say, "Europe or Asia."
Now, I point out, "You're not narrowing it down very much there, you know."
And you respond, "Well you weren't narrowing it down much either, when you asked me if I wanted to see the world!"
And you're not wrong, but it's also a bit of a silly argument now, since the point of talking about "the world" was to be broad and cover everything. Liberal Arts covers everything. I guess that STEM is supposed to be "everything, minus that faggy art stuff, and stuff that makes you think about things."