Me : Look.
1) We made a decision (to join)
2) We had a GE and a party won on a manifesto to re-ask.
3) We re-asked (the referendum) and decided to leave.
4) We had a GE and a party won on a manifesto to enact the decision.
5) Many of us don't like the result and so we should re-run the referendum or re-run it whilst pretending not to.
If you want to change the direction, get the mandate to do so. Win a GE on a manifesto of changing direction.
Me : Yes, hold a referendum on whether to hold a referendum or hold a commission that recommends this or just apply Parliamentary sovereignty. All manifestos are intentions, all referendums are advisory.
Me : Gosh. Many people, like myself, that voted for LibDem in 2010 won't vote for them again until they have totally reformed - all the old guard gone, all new candidates plus add about 20 years to trust them again.