As much as this may dissapoint you, I have to agree with your friend.
You are better off with a rock than with your Glock.
The reason is that he obviously needs a good smack on his head as a last ditch effort to get rid of his stupidity, and you don't want to dirty a Glock for that, rather use a rock
In view of the fact that your choice of firearm is so poor, I have bravely volunteered to help you out of your misery, Please give me your bank account so that I can deposit the 1$ it is worth and you can send it over to me, I will add it to my collection of previously unwanted works of art
Now, seriously, if you are profficient and confident with your glock you are fine with it as a carry weapon.
My wife's cary gun is a Glock, no problem carrying with a bullet in the chamber. just keep your finger off the trigger if you are not actually shooting.
The only "problem" I can think of is that for her to practice how to deal with a stoppage I have the create one, it simply refuses to jam.
Cheers,
Danny
PS, this thread is even better than the one about the Mall-Ninja's