That is an often repeated falsehood. I'm not sure you've thought that through and might just be repeating it as if it were true.
Your claim insinuates that governments own all property and there is no such thing as private property.
Can you give me an example of how remaining somewhere is the same as giving consent ?
Did all the people who got busted for pot, consent to giving up their body ownership to "the law" ? I don't think they did.
You can't pick and choose the laws that govern society, you take the whole lot by being part of it, you accept its against whatever and opt to do it anyway. Weed and such is always interesting to debate, but part of our society is that the benefits outweighed the costs so we choose to accept that we might be punished, but are willing to do it anyway. You could say the Phillipines represent a different sort of society, quite a bit less willing to break that social rule within that society.
Private property is murky. You pay taxes and it can be imminent domained. Your rights are really only protected and exist due to the power of the state, otherwise some stronger person can just take your shit.
I think nearly any business would be an example, but will go with a bar. You enter of your own free will, they have various rules of behavior/dress that you choose to abide by. If you want to wear shorts but they insist on dress pants, well you are operating outside of that society and they can boot you. The rest of the people within the bar can't stand hairy legs, they are good with that social norm. If the masses weren't, then they could leave and choose another barciety. They have bouncers to kick people that break the no legs rule, as a whole that group agrees to it. You can choose to slyly show some ankle, flout that rule, and maybe get away with it, maybe get kicked out, maybe a warning.
Edit: well Carl said it way better, serves me right for not reading till the end.