Dialect! No speaker ever admits that they have a dialect. Of course, when they listen to a foreign speaker they comment that the speaker has a dialect to their speech pattern. If the situation was reversed and they were speaking to a foreign audience; they also would have a dialect according to the audience. The important consideration in all of this is to remember that when you are speaking to any group, the possibility of having a dialect to your audience is possible. Having a dialect is not a problem. You must remember that for your audience to effectively hear you, you must slow your speaking and to enunciate a little more carefully. Your audience listening pattern must always be taken into consideration. A good example would be listening to your voice mail messages. Since listening to your voice message is not something that you do very often, you encounter the problem of understanding what people say. How many times have you rewound the message because you could not understand what people were saying? This is especially true when the person on the phone was reciting a callback number quickly. Experienced callers will always slow their speech down when giving a number for the receiver to call. As a speaker you must always take into consideration your audience’s native language.
And yes a southern audience listening to a speaker from Boston may consider the speaker having a foreign language, so slow down and clearly enunciate. It may seem very awkward to you but your audience will thank you!