I think it's not really about him getting more comfortable with mc, she said that he's not actually awkward himself, he's awkward around women specifically, so a different personality at a place he knows and with dudes he knows. It's also something you're probably supposed to pick up on too, mc doesn't acknowledge it directly but there are some scenes where his coworkers say "ive never seen him like that"(shy) or when mc's internal monologue is like "woah why is THIS guy considered The Funny One at his workplace..."