Why r spanish girls always hatin' on my one piece bathing suits?

Ok so i'm fit and my stomach is flat, whats wrong with wearing one pieces?? They're just more fun to wear bc they feel like they suck u in.. Like whenever im standing in the pools shallow end or sitting in my chair after getting out and adjust my suit spanish girls are always looking and laughing or hatin'. OK i admit that when you pull on the suit its like suctioned to u and does the SSHHLUP noise, but really its a one piece, they just do that! So why the funny looks?? All my one pieces do the slurpy noise thing, dont hate!!