Barca are trained to exaggerate when they're fouled, just to get a player sent off. It's not even debatable. They mastered that acting shit. Nobody says that they aren't fouled, but when they are, even if it's a minor touch, they are doing everything to make it look like the most brutal foul ever and get an opponent sent off.
Look at Messi here. He was elbowed. Not too strongly, but he was elbowed and Carvalho would have been punished later, even if the ref didn't see it. But of course, he decides to make a meal out of it, as all the Barca players do with every foul. And this was actually a foul so one could forgive Messi. But they are doing the same even when they're hardly touched