Libertarianism follows the belief that personal liberties should be maximised just so long as they do not infringe on the liberties of another. This is of course from the perspective of top down law, and not from the perspective of the court of public opinion.
Beyond that they want to put you in a Clockwork Orange device to keep your eyes and ears open and be forced to hear their insane rants for all eternity.
I am concerned that you are pulling your argument from misuse, and not from any fundamental meaning.
The Gadsden flag fundamentally represents libertarianism. Libertarianism is anti-authoritarian. This is, by definition, opposed to the idea of the rampant misuse of, and oppression by the police force. Libertarianism is not about some idea of "liberty for me, but not for thee". That is blatantly false. Anyone who follows that line of thinking is not a libertarian.
EDIT: Upon re-reading your comment, your repeated reference to "Liberals" doesn't make any logical sense. Liberalism (this heavily depends on how one defines "liberalism"), and libertarianism are not mutually exclusive ideologies. Nor are conservatism (this also heavily depends on how one defines "conservatism"), and libertarianism mutually exclusive ideologies. The only ideology that is mutually exclusive to libertarianism is authoritarianism.
They’re describing how people using the Gadsden flag typically act; they fellate the police as long as they’re abusing minorities. “Don’t tread on me” isn’t a statement of principal to most of them. What they actually mean is “tread on others while I watch and cheer.”
EDIT: From what I can see, your post history suggests otherwise. Still, though, I'm growing rather tired of the misappropriation of the Gadsden flag -- it is not a conservative symbol.
The joke is improperly founded, imo. The post's title "Kinkservative" more or less proves that the joke is founded on the presumption that the Gadsden flag is some auth-right symbol, which it is quite far from being. All this post does is push a narrative that the Gadsden flag is something that it is not. I don't want to see it be twisted into something opposite of what it fundamentally represents.
The Gadsden flag is fundamentally not a conservative symbol, so I don't know why it's being used, and treated as such. This post, and meme is presuming that the Gadsden flag is fundamentally represents those in the alt-right, auth-right, conservative, etc. circles. I have no idea why it's popped up in groups like the "proud boys"; they're idiots if they think it aligns with them in any shape or form.
The only way to prevent that from happening is for people to stand up for their true meaning, and to consistently, and publically denounce their misuse. The best way to cure bad speech is to use better speech.