Are priests allowed to choose whether they want to bless non-Catholics or not?

Granted, he was a priest "as old as the hills." People were at the Mass that were not Catholic and came forward with their arms crossed across their chest in an "X." The priest is supposed to bless the person since they obviously are not allowed to receive Communion. This priest, just stared at them, until they walked away. Either he doesn't believe in blessing other denominations, or he was too old to understand what to do. What do YOU think?