Why do people drive bad & too fast in the street? one last cursed at me while driving?

So I take my driving test this week. I have my permit and drive daily 5-10 min to the stores do errands. I was driving normal speed not too slow not too fast. The yellow light turned on all of a sudden so I slowed down, I was bit too close to the street light however I still slowed down to quickly stop. However I wasn’t driving so fast that I was able to pass the yellow light. My dad said to only do that if u are in the middle of the street and light turns yellow all of a sudden. So one older fat lady behind me goes to the lane next to me to curse and yell at me saying who the fuck showed me how to drive. She had face of a monster. Then light was green and cut in front of me driving really fast. I was like really? Maybe she don’t know how to drive. I notice most people drive too fast & not inpatient one bit. My dad drives good and not fast and he says everyone cuts him daily, many r so close behind you to pressure u to go faster.
Why do people drive bad & too fast in the street? one last cursed at me while driving?
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