Sainz made the comment after he found himself stranded in 16th place on the grid for the Abu Dhabi GP after hitting traffic in his last run in Q1.
The Spaniard's weekend had already been made difficult by a crash in FP1 after he bottomed out on a bump in Turn 3.
Sainz suggested that drivers deliberately try to make life harder for rivals.
"It's tricky," he said. "There were cars out there today… Between us drivers, we know that if you do a corner two seconds in front of another car, one second or two seconds in front, you're going to make him lose a tenth or two in that corner.
"I see people as the weekends have combined relaxing a bit on that.
"When it's tight in Q1 and Q2, I see people giving a bit of dirty air on purpose in some corners to maybe make the others lose some time in corners, which we don't consider impeding because it's not like you need to lift.
"But you know you're giving him dirty air and you're giving him a bad run in that corner. So by going out last, I made basically all sectors one and two very close to the cars in front, and I found myself losing tenths and tenths per corner."
He added: "I think everyone's doing it. It's just that if you put yourself in a bad track position, you're going to suffer from that more."
Source: Autosport