N EW YORK — Scrambling to replace their health insurance and to find new work, some laid-off federal workers are running into another unexpected unpleasantry: Relatives cheering their firing. The country’s bitterly tribal politics are spilling into text chains, social media posts and heated conversations as Americans absorb the reality of the government's cost-cutting measures. Expecting sympathy, some axed workers are finding family and friends who instead are steadfast in their support of