Non-knitting content - need to vent

I just got home from work. Take off coat and boots, dump bag, pick up mail. Phone rings. Answer. Voice on the other end says, "Is that the damn housekeeper?"

I'm flabbergasted. This is my grandfather on the phone. Yes, he's old. Yes, he's crotchety. BUT:

a) we don't have, and never have had, a housekeeper;
b) since when is swearing at someone an appropriate way to start a telephone conversation? and;
c) I'm nearly 35 years old. He should be able to tell my voice by now.

I was so furious, and hurt, I just handed the phone off and made a cup of tea, then came down to the computer. I feel like crying. I feel like calling him back and telling him off. I feel angry.

That's it. I'm going to drink my tea and as soon as the red mist of rage clears from my eyes, I'm going to knit something. That's all.