Yeah, at all costs he must use a new tone when speaking to a community that has Rob Reiner as one of its leaders.
A more traditional tone means more presidential and less incendiary. We would expect Trump to be not so outlandish and likely garner less free media coverage. And Manafort is laughing all the while as he explains this to reporters.
Taming Trump’s wildness and hilarity at rallies has nothing to do with Reiner and Reiner has nothing to do with the RNC.