There is a way to prevent yourself from being host before a round starts that works 99% of the time. I shouldn't post it since it's really going to impact the game once everyone starts using it but i hate Host Lag so much that i don't care anymore
Grab your smartphone and connect to your house wifi. Open a program called Speedtest.net and run it while your in the lobby. It drags your ping and internet speed so low that the game detects your speed as crap and migrates to another host.
The only time this will not work is if you join a lobby and don't have enough time to run the test.