If Trump wins the general, I may change my registration to Republican. For every voter like you, there's a voter like me.
Because you can't vote for Trump being a registered Democrat...?
Although maybe one could simply vote for the other party in one election, it would make sense for him to associate moreso with the Republicans if he feels that the rest of the Republican electorate is on the same page as he is (as is the case with the Trump nomination).
It's likely that you're just afraid to admit the reverse - that your party has been taken over by basket-cases but you don't want to leave it.