Justin had no shame in it. Spending a year in Azkaban for his birth status kept him from hiding it. Sure he was more nervous now of making enemies for his stupidity but there was absolutely no fear of what someone might do over his blood. There was only one thing worse than being shut up in that black hole, and it was death. With the Wizarding world finally stabilizing somewhat he felt secure in himself.
If there was good that came from Azkaban it was that Justin was now very proud of his other world. People knew his status in school because of the basilisk attack and now as an adult they know because of his employment status.
"Muggles are just like you and me, but simpler. They know nothing of the life we live. Really, when you find you magical abilities you look back on your old life and wonder how you lived without them before." Anyone who worked with him knew his status now too, they actually tended to ask him questions of what would be plausible. It seemed he was the filter they used before going off to complete a Muggle Excuse.
"Really must be a rush. Quick on your feet still I take it," he remembered her being talented with a wand back in the DA.