She owns her own business. I am contracted to work part-time but have been working full time for the last few weeks, covering staff holidays etc. I am a good worker, always on time and have never refused to work extra hours or all day when asked to a short notice. She is generally a good boss, but is a bit of a show off to customers, making inappropriate comments and doesn't seem to have a filter. Today she told a customer she would get 'her bitch', (me) to get something for him. There were a few customers who witnessed this and they were all a bit 
. I told her I didn't appreciate being called this, but she says she's the boss what else is she meant to call me? I suggested she used my name. I am absolutely raging, but stayed completely calm at the time. She has used this term about me once before and I asked her not to use it, but it happened again today? What can I do, there's no boss above her to report this to. OH suggests I tell her that her bitch resigns and to stick her job up her ar$e?