Pull up your panties and carry the Glock 30. It's made for concealed carry.
I carry a Glock 23 (with love handles) and while it's not totally 100% comfortable, it's not a problem.
Carrying a gun isn't like carrying a cell phone. We have to endure some level of discomfort to be good citizens.
Man up and leave the .380 at home.
Using the "standards" set in your statement, you're the ***** because you carry a smaller caliber...
I disagree with your statement and would advise him (or you) to leave the "macho" mentality at the door. Instead, he should carry what he feels most comfortable shooting and carrying.
A 230 grain bullet does him no good if he can't hit anything with it or doesn't ever have it on him. Plenty of people have died from .22LR's, yet alone a .380. If he practices enough, he can become just as effective with a .380 as he would a .45.