I don't agree with the hands flat, palms down suggestion. Too often that will look like a karate chop. Remember too that you will probably be offering that free hand to the lady to lead the next figure and it will usually need to be palm upwards by then. In many figures the man is showing off the lady so imagine you are presenting the lady to the audience and saying "isn't she beautiful".
Ladydance's 'chicken wings' expression conjures up in my mind a picture of the arms flapping up and down with the elbows stuck out as used in the 'Birdie dance'. I normally refer to an arm dangling loosely by the side as a 'broken wing' and if this is what Ladydance means then I agree that it must be avoided.
Think of the arms as an extension of the body. Try to give an impression of balance between both sides but there is no need for a full stretch.
The arms should unfold rather than shoot out, so try this for practice:
Stand facing a wall, about 18 inches away, feet apart. Now, using either hand, imagine you are holding a paint brush and paint the longest, smoothest, horizontal line you can with several repeated strokes from side to side.
Men are usually self-conscious about using their arms when dancing, but remember this - If you are doing the arms correctly then nobody will notice! We only notice things when they look wrong.