They offend other countries and religions that don't appreciate this lifestyle. They should respect the law of the land in other countries and not imagine they know what's best for other countries.
Here we go again... How many times does it have to be said that it's people who decide what their lives will be, not some "culture" or "system" or "country"?! What kind of totalitarian fascist does one have to be to assume otherwise? Moderators, I hope you keep track of such intolerant statements here, and take appropriate measures...