That's just stupid - a second referendum? - on what?
No it isn't stupid - it is very sensible, and might even be necessary under the European Union Act of 2011.
The referendum would offer a choice between the agreed negotiated post brexit deal and, presumably, remaining in the EU.
So there would be an equivalent choice - people would be for what they are for, not what they are against.
So out of interest if there was a referendum offering that choice - i.e. Norway style EEA membership (meaning we leave the EU) vs remaining in the EU - how would you vote, or would you even vote given that it seems neither choice seems acceptable to you.