The Dragons boss saw his side outclassed in the 4-1 friendly defeat in Cardiff on Thursday night.
But Giggs believes the painful loss dished out by the Spaniards will only improve his squad after reliving his own playing experience.
Giggs said: "We came up against a Spain side who were far superior in every department but it was a learning curve.
"In my playing days, we played Juventus in '95 and '96 and it seemed like they were a million miles away.
"They beat us 1-0 and it could have been a lot more. They had Boksic, Zidane, Conte, Deschamps, Del Piero, not a bad team.
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He quipped: "We used to say we're going to sleep because we've heard his team talk so many times!
"I've taken tips from him. He used to bang on about how hard work is a talent. Of course, I take all those things on board that he said."
Giggs takes his youthful Wales side to Ireland for a Nations League clash on Tuesday night.
And the 44-year-old wants the likes of Ethan Ampadu, 18, David Brooks, 21, and Harry Wilson, 21, to bounce back quickly in Dublin.
Giggs, speaking on Football Focus, added: "The young players have good quality and mentality but mentality is everything. Players are very quickly lauded now with a couple of goals and good games.
"You take Justin Rose. He's the fine example who came onto the stage at the Open and was quiet but he's been world number one.
"I always reacted to criticism in a positive way. I would try to prove people wrong. From an early age I had that.
Ireland stars walk out in Cardiff as they warm-up for Nations League clash with Ryan Giggs’ Wales
"I was taught to take on the full-back ten times, I might get tackled nine times but so what? The tenth time you might win the game or score the winning goal. It's always been my mentality. It's hard to tap into players when you have them for such a short space of time to see what makes them tick.
"The biggest disappointment against Spain was not doing the basics. I want my team to be comfortable on the ball and when the person is on the ball to always have options. "That's the basics. Everyone is capable of working hard, sprinting to the ball and making it as difficult as you can for the opposition."
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