He must mean the bad temper part. Latinas will fuck you dry, especially if you're a white guy. But the flip side is the emotions and temper tantrums that are a pain in the ass to deal with. The latina I was with would let you put your dick wherever you wanted to if you gave her enough tequila...
This has been the last 10 years of my dating experience in a nutshell. Amazing in bed, great cooks, generally care for you, super tight/wet/hot pussy, but they are meaner than hell and get mad so easily. I've had several women straight up attack me with random objects and shit over a simple disagreement.

And yeah, the "spicier the better" is true. The meanest bitches will snap your cock off with their hips.
Mexican, Puerto Rican (most violent), Cuban, El Salvadoran, Venezuelan, Columbian (the worst attitudes), Guatemalan, Peruvian... I've dated a lot of latin chicks. I absolutely love the way they look and act when they are in a good mood. But once they get pissed off (which takes very little) it's a very bad situation.
That's right, most love anal and will fuck your brains out for hours. They can be very aggressive in bed, almost too much. They will suck you off, let you do whatever you want to them in bed and cook you the best breakfast you ever had. But don't you dare try to argue with them or tell them what to do. Those are fightin words!

They aren't worth it, i've almost caught a few cases from getting into fights with them. Simply stiff arming a Mexican broad to get away from her attacking you with a knife is enough to get arrested. I'll take my chances with another "species".
Currently dating a half Flip/Thai chick that has curves. She's a bit boring but i don't think she will ever try to knife me.