Gotta picka pocketa two
Credit should be given where it's due, the dips in Barcelona are world class, they come from Columbia, Algeria, Romania and many other countries.
If a Guild of Pick pockets exists anywhere, it will be Barcelona.
If you visit, all pockets should have zips and Kevlar razor resistant linings, same with bags, anything not in a sealed bag or pocket should be chained to you and be sure to regularly count fingers and limbs.
I prefer exhibitions in Madrid, a nicer cheaper city with less crime overall in my experience.