system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Brexit and what's so bad about it?
gpt
Without getting into the "it's good" or "it's bad" politics of it:

Britain has been a part of the European Union for a long time.  The European Union is an extensive agreement between all its member nations allowing for greatly increased and deregulated international travel, immigration and trade.  Their economies are heavily intertwined - kind of like a couple that has been married a long time and have a lot of joint purchases and accounts together.

Brexit is Britain's recent decision, made by the majority of voters, to leave the European Union.  They now have a few years to sever most of their attachments to the rest of the European Union, like a messy divorce.