To dispatch the examples of Gandhi and MLK--please ask yourselves how their civil disobedience would be handled in modern America. Ask yourselves how their messages would be mocked, subverted, and distorted with modern social media, even without state intervention. These are different times, my friends.
(Also, mentioning MLK while glossing over the credible threat of armed domestic terrorism posed by Malcom X, the Black Panthers, and many other factions at that time in American history is inaccurate--you miss a lot of the background political pressure brought to bear by people "standing up to bullies".)
The reason I asked the parent question was not to be ghoulish or edgy, and I mean that sincerely.
The fact of the matter is that the quaint notion of "standing up to the bullies" is completely out of date. You probably imagine telling some guard to fuck off, and when they return with a cop, what then?
You'd give the officer (who is probably of less-than-amazing intelligence, because of a court case years ago allowing PDs to discriminate on that) a lecture on the freedom of panorama, and they'd let you be? If not, then what?
If you don't resist, you hardly have "stood up to the bullies".
If you resist and lose--and remember, resisting can be anything as simple as bleeding on the officer's uniform when they decide to truncheon you--you will then be rewarded with the slow grinding gears of American "justice". At the very least, even if found innocent, you'll be out major court costs and time, while the bullies go about their business unimpeded.
If you resist and win--say, by beating the shit out of the bullies--then they'll summon additional forces until you are subdued. Subdued repeatedly. There may be an investigation later, but that'll be of academic interest to you while you're handcuffed to a hospital bed recuperating to be in good shape for your prison sentence.
So, again, bearing that escalation in mind, think about my earlier question--because that's the inevitable chain of actions that start with "standing up to the bullies".
And that's why when a poster points out that maybe standing up is just not a good idea, we shouldn't downvote them.