Wow! This topic hit a nerve!
I don't think that the portrayal of women on dating shows is the point, here. As Americans, familiar with the reality genre, we know to expect the "characters" to be edited down to one dimension, like Sarah Kozer the "goldigging b*tch", or Zora the "nice girl", like "lazy, useless" Osten (S7), "whiny quitter" Flo (TAR2). We know that all of these people are much more than the condensed version we see, but enjoy that process as it makes for easier watching and a more flavorful cast. Also, I think the appeal of reality TV is that (even subconsciously) we imagine how we would behave in these manufactured situations, and hope that our reactions would be so good that it would prove that old true line "You can't edit in a bad personality."
Regarding the European girls, my only wish is that there were no Czech girls. All the others come from wealthy countries with fantastic education and healthcare systems, and I think that makes laughing at/with them fair. They seem to be model/actress/waitress types, and if it weren't for the accent, they could be Californians. The Czech girls though have been through the fall of communism, the velvet revolution, and a nation's desperate attempts to join the globalized capitalistic modern world, and I think using a couple of this country's pretty young women in what amounts to a mean practical joke is cruel.