Okaaaay. And do we have any evidence that the company in the OP are actually doing what the OP claims?
There was a thread here a while ago in which we discussed a UK company, Sheila's Wheels, which offers insurance to women. They advertise as such and it's all very pink and girly.
They don't, however, claim to offer insurance
only to women. That is the crucial difference. But they have made their branding so feminine, and their wording so vague, one might easily mistakenly think they refuse insurance to men. They are "an insurance company designed for women". In marketing speak that just means "aimed at".
The truth is men are just highly unlikely to use them, but they don't actually refuse to insure on grounds of gender.
It's a marketing ploy, also known as spin. I have a sneaky feeling the company mentioned in the OP is doing the same thing.
How does it work?
1) realise that you can get a lot of business from female drivers if you offer them cheaper policies based on accident rates
2) think of a way to attract women and put off men without breaking any laws or paying lawyers
3) create a bright pink, girly brand with ambigous descriptions
4) hope that men are too embarrassed to want to use it or too stupid to realise they can.
You can discuss discrimination all day if you like but until someone provides a link to the company in the OP we have no idea what they're actually claiming.
ETA: In the same thread I mentioned, Brodski brought up some interesting info about a case in Strasbourg which meant that insurance companies could, in theory, refuse to insure a particular gender, because of the accident stats. But Sheila's Wheels just pretend to. I suspect the OP company is like this rather than the bolder type which refuses men entirely. It's possible, but much less likely.
ETA: Example of company which is cheating:
www.sheilaswheels.com
Example of company which only insures women:
www.diamond.co.uk
Notice the huge differences in statements made on the sites.