I lived near PAX River for eight years and did not find the racism that you mentioned. Even if some of the locals are that way, it is probably more the over 60 crowd. Also, St. Marys and Calvert Counties have added a huge number of new residents from outside the state in the past 10 years.
Racism still exist in MD, the head of the KKK lives in Cecil County and Flies a Confederate Flag over I95 with a crain in his back yard. The funny thing is that he is a registered Democrat. The racist are in the Democrat Party so Ehrlich might atract their votes but Steele will not, however, he will get way more Blacks to vote for him thus countering the Racist D's.
Yes, it is the over 60 crowd, and they're mostly in Ridge and 7th district. Unfortunate for the rest of the folks in those two places, because St. Mary's locals in general are great people (natives AND newcomers).