Visiting Barcelona, Madrid, and Lisbon. How bad are the pickpockets?

Hello. I plan on visiting Seville, Madrid, Barcelona, and Lisbon. How crazy are the pickpockets there and what should I expect?

I’ve visited other dense cities such as Rome, Paris, and NYC. I was super conscious of my surroundings and never saw any sort of pickpocketing.

Should I feel just as safe visiting these cities? I’ve heard Barcelona was especially bad for tourists. This time, I plan on bringing an expensive camera with me, but it’ll always be strapped around my neck and wrist. Should I worry about snatchings?