I think there's a difference between a member of the party's national committee and a state legislator. The party can't force out the elected legislator if his constituents vote for him. The party can get rid of a national committee member. If they continue to let him sit on their national committee, they are, at the very least, failing to condemn his outburst.
The guy has only been a RNC member for less than a year, got elected at the 2012 state convention via a push from the Tea Party and Ron Paul supporters to oust a party "RINO". Former most conservative member of the Michigan House in 2011.
Former USAF fighter pilot and Top Gun winner, then an airline pilot. Does lots of documented charity work, etc. His press releases over the past six years are quiet on gay rights/gay marriage (from the 20 or so I found and reviewed), so he does not seem to be an "anti-gay activist" type.
Much ado about nothing, in terms of relevancy to the Republican Party nationwide.