The semester is finally over!  I can not say how happy I am.  It has been very difficult this time as I'm learning that not all teachers (college level included) are there to help their students or to even teach them what they need to know.  It should not be a task that you have to perform, it should be one that you want to perform.  If a student asks for assistance or clarification on something then as an educator it is your job to respond in a helpful manner, not in a sarcastic manner.  You do not know what that student goes home to, so you don't know if they are an air head or someone facing a lot of stress - just get over yourself and give the person an informed answer.