Who said anything about 90% of intelligent economists? I take it 90% is another number made up by remainers, but I'll leave that for now.It's not an arrogant statement. If 90% of intelligent economists are warning against leaving, then given the vote, they will vote against leaving. We can't deny that they are experts in their field and therefore more intelligent than you and I when it comes to economics.
Unfortunately, similarly to climate change, someone will always be able to find someone that is an economist that disagrees. However, when the vast majority are saying remain, it makes sense to listen to that opinion. That isn't arrogance.
You said, "The vast majority of intelligentsia are warning against Brexit". Total arrogance assuming that it's the intelligentsia that want to remain, and therefore by definition it's unintelligent oiks that are going to vote to get us out. Your inability to realise that all these people - those that you think are so wonderful that we should hang on their every word - have their snouts firmly embedded in a very nice trough, is staggering.