Response to Dr Hall:
“The halachah is that if someone is a kosher eid you accept their kashrut”
The OP trusts the guy when he expresses his beliefs, and she is not comfortable with his level of kashrut. Or you can say she does not trust him. Either way….
“Another halachah is that when you settle in a new community…. “
College campuses are not communities. If one is asked a student “where is your home?”, the student would likely say their home town, not the campus. Besides which, the community has no real religious leadership. Most American Orthodox rabbis – like the RCA, Aguda, and YI – don’t accept YCT semicha.
“…halachic norms.”
There are no norms on a college campus. You went to schools with large frum populations, Harvard or Hopkins, but most schools have only a handful of frum Jews – with a bunch of different levels. A handful of transients (and a pseudo-rabbi) are hardly a reason to change.