I think it is rude to not put the effort in to be understood. When a person whose first language isn't English the polite thing you normally see is that they explain their situation and you can tell they are making an effort to communicate. They will say something like, "Sorry for my bad English...." Those people I help and I'll put the effort in to try and understand them. I'm meeting them half way. They put the effort in and I put the effort in too. Here I see no effort. If there is another handicap it would be good to know. Otherwise I see indifference. Geez.