there is a difference between "selling" an actual foul to the ref with body language and flopping. selling the foul is pretty common among euro players, if you get fouled you overact, everybody does it, refs don't see a problem with it.
the harden situation is different though. harden has gone beyond flopping, he even locks arms with defenders to get a foul call. also the guy travels, a lot. he can start a traveling agency ffs.
european refs are very strict about traveling, offensive fouls and flopping. especially about traveling. harden palms the ball or goes under the ball a lot, not even mentioning his extra steps. the guy is spoiled by the nba, but he would still dominate other tournaments. after a few traveling/offensive-technical foul calls he will get used the euro style officiating and keep on owning.
harden is a total package. imho only nba "superstar" that his game won't translate to euro bball is westbrick. the guy can't shoot, has zero court vision and bball iq. no coach will put up with his stat padding bs.