Who doesn't want to cheer for the seemingly milksop honor student who stands up to the schoolyard bullies?
From the en.wikipedia.org
But openly sob mid-meeting over some unfavorable feedback and you're likely to get labeled a mewling milksop.
From the abcnews.go.com
Some workers even pretend not to like their boss in front of their work colleagues in case they are thought of as a milksop, in their mind.
From the expressandstar.com
Cast against type, Aaron Eckhart plays Bill as a cringing milksop, ample gut waterfalling over his waistband, lank hair straggling lifelessly across his brow.
From the fresnobee.com
More examples
Sissy: a timid man or boy considered childish or unassertive
A weak, easily frightened or ineffectual person; A piece of bread sopped in milk