I found the exact same when I had a BMW M3. That is why I moved to MB.
Maybe it's the AMG badge more than simply the SL ?
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It's not the make of car it's the perceived £££ value. or as I think they see it "I can't afford it, so U can 'F' off"
e.g. look at him in his Big Merc... "have some of that" from my ******(Insert lesser car here) ...
It's the way a fair chunk of the UK behave IMHO I get this whether I'm in our Old Porsche, New Golf or W208.
Every little wanabee wants to race or does something silly to get in front of the 911, and I let them.
It's taken to long to get my 911 to bin it informing a little Herbert of Porsche racing credentials
I'm pretty sure if they "want some"* on a trackday my trusty old Porsche would "tear them a new one"*
It's not worth saying anything, hopefully they'll get it when they grow up.
Another poster mentioned there is a big difference between driving quick and driving like a tool, there is a time and a place, rush hour, busy twisty A road's ect is not it.
Clear roads, good weather and well It's a free country...All the Police are in London anyway
* I believe thats the right terms from the yoof of today lol