Interesting thread as I will be teaching this in a kids bike rodeo in a couple of weeks. Only 23 states have changed their laws to allow for a right arm signal for a right turn. Wisconsin does not consider the right arm signal a legal signal:

http://folio.legis.state.wi.us/cgi-b...fo&jump=346.35

Guess we all need to periodically check our laws on such things. Either way, those two people knew what you were signally and should have respected it.