@MindYours. I used to drive a little car similar to yours out in the wilds and was always flashed.
It’s just arseholes. Blokes who want to pass, or think it’s funny to intimidate the little woman driver...
I’m sure you are a perfectly competent driver- I am, and after years of being flashed, I realised it was just when I drove my little “woman’s car” NEVER happened when I drove my VW golf GTi or later on my Jag.
Try putting a blokes’ baseball cap at the rere where any flashy arsehole can see it. It might give them pause for thought.
And if there was ever some fucker driving up my arse, I’d just put on the fogs to make him think I was braking, and he’d ease off.
Some men just cannot stop themselves flashing a little woman - it gets to the point where it’s just harassment. Individually I think they think it’s ‘their little joke’, but it builds up as a pattern of harassment, and can be very unpleasant.
As I said I used to work out in the wilds, in real cowboy country, and used to keep a piece of an auger under the passenger seat, just in case some yeehaw tried anything on.
Try and get the number plates, and make a report to the police if it’s bothering you. You might notice there’s a pattern...
keep your phone charged. Get a camera?
Good luck.