I often feel that with STEM it's not as important where you gain your degree, whereas with art degrees it is essential. Of my siblings, my sister who studied history at Durham is doing the best financially. My other siblings studied STEM and earn ~ a third of what she does. She works for a law firm in London, and earns an insane amount. She loves her job and finds it extremely stimulating. Her history class mates have gone on to incredibly diverse and interesting careers. Now, if she had studied history at say... Liverpool (a respectable red brick university, but not the 'standard' of Durham/Oxbridge) she would have struggled to break into law in London - she admits it herself.
The STEM 'master race' rhetoric is complete nonsense and I advise anyone and everyone to ignore it. What people on this website can't seem to grasp is that a degree isn't everything, employers just don't care that much, they really don't. They want hard working, social individuals who can function within a team. I know plenty of successful people who have studied STEM and the arts.
I myself plan to apply to Oxford to study history, as well as Durham, York etc... I do not worry one bit about my career prospects. I want to study history because that's where my passions lie - whilst at university I can intern etc and find what I want to do. The only thing I will say is that STEM degrees are more vocational, so you can go to a lower ranking institution and still find a graduate job. For arts subjects, that is less likely. If you can get into a top 10 university, you have nothing to worry about.