All the people didn't vote - I didn't along with millions of others who were affected by it. The loss of EU. status could mean millions of Britons suddenly having second class status in other countries, yet they had no say in it - if you call that democratic, I don't - and, because of that disenfranchisement (a practice not done by any other EU. country) I do not accept the result o.k. !
Then why aren't you marching?
Just before the referendum there was an attempt to enfranchise ex pats, because they are affected so much by the result. The government plans to change this but did not do it in time for the referendum......so, over half of all British people living abroad (over 3 million) had no voting rights. This is the issue which could be challenged.