Final answer:
The nobility isolated itself from the Third Estate through a separate lifestyle and economic privileges.
Step-by-step explanation:
The nobility isolated itself from the Third Estate in multiple ways. Firstly, the nobility lived a lifestyle of luxury and excess that was completely detached from the lives of the common people. They had their own separate social circles and rarely interacted with the lower classes. Secondly, the nobility enjoyed privileges and exemptions from taxes, while the burden of paying taxes fell heavily on the Third Estate. This economic disparity further isolated the nobility from the common people.