You are fully entitled to campaign to rejoin the EU after we have left. It will be a perfect opportunity for you to vote on the information you will have on what life is like for the UK being a non member. There is no new information about the functions of the EU that would make me want to rejoin......ever.
I'm glad that works for you, however there are many who would like to have the option to reconsider, based on what they know now.
If you wish to deny them that choice, it says rather a lot about you, and none of it is very nice.