It's not my first reaction, it's not something I do when I'm traveling, but it's either be slightly loud and aggressive or just suffer in silence. I chose the former.
Having just returned from a trip to England, whenever we were in touristy areas we saw a very high increase in the level of aggressiveness/pushiness while waiting in queues with certain foreign cultures.
At first we suffered in silence, thinking "well that's just the way they behave in their country", but towards the end we were very direct and to their face when being rude to finally get them to stop.
At first we suffered in silence, thinking "well that's just the way they behave in their country", but towards the end we were very direct and to their face when being rude to finally get them to stop.