I used to teach at the local community college. I hold a Master's degree, and I always asked my students to just call me "Dave" or "David". At the community college level, your students fill the range from the new high school graduate, to the older student that had to quit school to work, and is now trying to obtain their degree. Some students called me "professor" or "Dr.", and I'd always gauge if it was meant with respect, or an attempt to, ah, polish the apple. If it was the former, no problem. If it was the latter, I would usually tell the students "God made my butt for me to sit on, not for you to kiss." It always got a laugh, and eventually, most of the students ended up calling me "professor"or "Dr", rather than my preferred "Dave". Sigh, it is at least better than other things I've been called in my life.
Regards,
Dave