I don't see the hypocrisy. Does the Singapore-EU trade agreement give EU citizens the right to vote on laws that will be binding upon Singaporeans? Or give EU citizens the right to reside and work in Singapore? If not, there is no hypocrisy in supporting Brexit while relocating to Singapore.
It is disingenuous to portray the EU as merely a trade organization. It may have started out that way, but today it is a supra-national government, capable of binding the citizens of member states to laws those citizens oppose (just as, e.g., the United States federal government can bind citizens of Alabama to laws those citizens oppose). See: https://en.wikipedia.org/wiki/Regulation_(European_Union)
It is disingenuous to portray the EU as merely a trade organization. It may have started out that way, but today it is a supra-national government, capable of binding the citizens of member states to laws those citizens oppose (just as, e.g., the United States federal government can bind citizens of Alabama to laws those citizens oppose). See: https://en.wikipedia.org/wiki/Regulation_(European_Union)