Mainly Earth Systems Science which the podcast is modeled around (a course that integrates geology, hydrology, meteorology, climatology, biology, and universal history), but I've taught varying intro geology and environmental science courses through the years along with biogeochemical modeling, remote sensing, geomorphology, meteorology, and climatology. My PhD is in paleoclimatology in which I made computer simulations of speleothems as archives, with their growth rate and isotopes as climatic proxies.
The student in question was mainly upset with my coverage of deep time and evolution in my Earth Systems course. He is now a chemical engineer and I actually saw him post on one of the ICR's sites that he has made the disproof of abiogenesis his goal in life. I'd pull him aside the next time I see him to remind that unexplained is not the same as unexplainable, but I don't think it will help.