Don't even let people know you have them, unless your working and you can't avoid it. YES this means you CAN'T show them off to your friends
I agree completetly

Meaning that when something gets stolen one of your friends says: "Hey guys do you remember how xxxxxxx showed his lockpicks once?" And about half a minute later everyone is sure that this poor xxxxxxx is behind the theft...
I dunno how well I made my point with the story, but in a nutshell:
If you show picks to friends they will think that you have criminal intentions. (It's sad that people don't see picking as a puzzle-solvers hobby

...I dunno if this makes sense to you, but I think that it's good to have a healty little paranoia
