in GTS, i would often pick the non-meta cars at this track, because i'm special dammit, and i felt faster in some parts. like you, i would assume people are just jerks who would throw their grandma into traffic for an extra DR point.
what i learned is that this is the one track where you can't really do that, unless you want to be 'that guy' for all the other drivers. theres a small window for drivers to keep their speed through the chicane, and if there is a car going 20% slower through the gap... well, it might get hit. of course its on the driver behind to watch out for that sort of thing, but its hard to blame people for not wanting to lose so much time every lap.
again, not trying to make you feel bad or anything. optimally you are sort of 'working' with the other cars to make sure you're all running as fast as possible. if you're constantly getting charged by cars flashing their lights and trying to get around you, i think its on you to change cars or make room for them to pass.