Japanese love stereotyping

In the past few weeks I have noticed that there is so much blatant stereotyping going around in Japan it's nauseating.

I go to an electronics store to get something for my computer.
The shop assistant gives me a leaflet saying "this is really popular with women because it's easy to understand"
So, like we are dumber than men?

I am getting a new cell phone.
You will be amazed at the offerings here.
There are like 500 styles, seriously.
The shop assistant shows me several styles, telling me "For the ladies, I think these designs are nice"
No I am not interested in leopard print or pink crystal. I want chrome.
"Oh, those are really popular with men. Are you sure that's what you want?"

I shop at a supermarket.
They were giving out freebies to taste.
So I take one.
The guy handing it to me tells me that "young women all love this".
Well, I'm not your typical young woman and no, I don't like it, is what I said.
Yes confrontational, a social suicide in this country to be saying something like that in public, but these seemingly harmless stereotyping are so annoying.