Would you also be ashamed of Jesus?  He spent his public life going out of his way to DAILY teach and heal the sick, the lepers, the poor.  Jesus could have stayed in Galilee and preached from the synagogues---but he didn't.  He went out among the poor and the sick.  He could have preached in the Temple, but instead he lashed out against the injustices of the money-changing system.  

And if you read the Gospel of Matthew Chapter 25:31-47---we see what the prep-sheet for the Final Judgment by Christ is going to be.  Unless we go out and feed the hungry, give drink to the thirsty, WELCOME THE STRANGER, give clothes to the naked, visit the sick and imprisoned----as part of our identity as followers of Christ, we have no right to even hope for an eternal reward.

It is not social activism, but it is following in the footprints of Christ---as Christ demonstrated it to us.