For crying out loud, the fact that a dude that owns a ton of Progressive stock and isn't really involved in the actual running of the company much anymore donates his money to causes that don't meet your approval does not have anything to do with Progressive as an insurance company. The company itself has nothing to do with how one fruitcake spends his money. From what Snopes says, it seems the guy really, REALLY likes his weed, and appears to want to invest in weed's future, lol!
Now, if you boycott Progressive for fear that one cent of your money may end up in the dude's bank account... well, if it bothers you that badly, go ahead and boycott. But it isn't the insurance company itself that is doing anything... err, depending on your political views... wrong.