I teach at at community college, and I would say … “it depends”. It depends on the college and it really depends on the class you’re taking.
Kids from the local high school that take intro level classes at the community college, sometimes as part of getting their associate’s degree during high school, are by-in-large taking classes that are easier than the most rigorous high school classes. For instance, Bio 101 at my community college is much easier than AP Bio. It’s meant for an entirely different student.
However, kids that take DE classes because they are at a higher level than offered at the high school are in a very distinct category of rigor. In my experience, that is most often students who took AP Calc BC in sophomore or junior year and need higher math than their high school offers. I think this is because math tends to move in very linear pathways, so you can max out at high school.