Contact patch has been mentioned. Yes, a bike is lighter, but has a far smaller contact patch. Unless you're riding one of the latest bikes with advanced ABS, a rider also has a more difficult time maximising braking force. A car driver simply has to ignore the vibrating peddle and mash it to the floor.
Further, while you may be able to stop quickly, consider the car behind engrossed in their mobile. You might stop short, but will they? You could well end up the meat in a sandwich.
You're best to use the manoeuvrability of the bike to gain good forward observation, slow down early for issues ahead and thereby manage the speed of the traffic following you, give them time to pay attention etc.
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