expostulate

cavil, quibble

challenge, dare, defy, fight

conflict, debate, dispute, hassle, quarrel, squabble, wrangle

beef, bellyache, carp, caterwaul, complain, crab, croak, fuss, gripe, grouch, grouse, growl, grumble, grump, holler, keen, moan, murmur, mutter, nag, repine, scream, squawk, squeal, wail, whimper, whine, yammer, yawp (or yaup), yowl

balk, gag, stick

censure, criticize, denounce

disobey, rebel, withstand

demonstrate