I say this not to come across as a racist or seem discriminatory, but something that really bothers me with regards to professionalism is the misuse and pronunciation of the English language. I know quite a few pilots, working at the regionals, who I sometimes have had a difficult time communicating with and understanding in just basic conversation. I respect those who are naturalized or legal to work here, but it just doesn't sound good on the radio when you have a guy who cannot be understood or create basic sentences easily.

Same thing goes for those with very heavy backwoods country/hillbilly accents. It's just not professional and makes you sound like you don't really know what you are talking about, even if you do.