While some people will take the time to be patient and relay what they spoke again and again for a Deaf or Hard of Hearing, it is sad to say that there are those that assume that Deaf or HoH don't pay attention when the hearies speak to them, hence the fustration and impatience that ensues, and the accusation that they are not paying attention, then giving up with "nevermind"!
Um, that's not the case, you may be confusing the Deaf or HoH or you're speaking to fast, your lips are quirked or twisted funny, or you didn't get the attention of the person before speaking (you know that annoying thing where the hearies are looking at you and talking and you turn and you're only catching half of what they are saying ?)
Don't accuse those with HoH or is Deaf of not paying attention, they are but they are trying to understand what your saying, because for some of us it does take a few minutes to think about what your saying to understand it, and read your lips at the same time, all the while getting uncomfortable watching your body language change from calm to fustration because you have to repeat yourself constantly, finally ending in an fustrated "You don't pay attention!"
Reading lips is like morse code. For those of us it takes a few minutes to decypher the words your are speaking. When you can't hear, you can't hear the sounds associated with the words your speaking. Some words and letters can look the same to us.
IE: Bliss=Blitz Todd=Dodd
or the letters P and B
or T , C, and D.
Or S and X
Without the sounds of the letters, and without the sounds of the letters combined into words, we have to figure out what is being said sometimes. It's like that for me, I have to go through a list of words and fill in the blanks to try and make sense of what you are saying. It takes me a few minutes and yeah i might have a blank look on my face, but don't mock me with the same look, it only says "You're Stupid" to me.
Try to have patience with us, sometimes we get uncomfortable when you start getting impatient with us.