There are classes for non majors, they’re fun and light - kind of like “Intro to philosophy” isn’t the same as Epistemology for Philosophy majors :p. Often, college catalog descriptions will include a sentence at the end such as “not suitable for science majors” or “does not count toward the bio, chem, physics majors”.
For instance, compare
http://www.physics.sfsu.edu/~jfielder/Phys101S15syllabus.pdf
and
http://www.physics.sfsu.edu/~barranco/Syllabi/Phys220syllabus.pdf