One of the charming attributes of crapcan racing is that the cars and drivers are a mixed bag. This makes the driving more fun, but also more dangerous. Drivers in particularly fast or slow cars need to pay extra attention because they create dangerous situations with their very different closing speeds.
Who is at fault here? 100% of the blame goes to the faster driver. With a car that good, he can choose where to pass, and stealing the apex under braking is a seriously bad idea. If you can’t drive your cheater responsibly, GTFO.