You did not go too far, and you are right, but your interaction highlights how the problem with captured representation is being hidden by exacerbating partisan politics.
This also affects us in a very tangible way, because conservatives, as you yourself has pointed out believe in
Due to the conservative leader’s authority, it is the duty for the conservative to accept and internalize the leader’s message, regardless of whether or not the conservative understands the message or not.
You may have educated him to some degree, but until you can get him to disregard the authority he has placed himself under, you likely alienated him by revealing yourself as an “evil temptor and seducer”.
As demonstrated by conservatives clinging tightly to Trump as “Supreme Leader” (an exageration, but a reasonable label according to how conservatives treat him), Trump can do anything, even go against so-called conservative values AND break the law without significantly affecting the fervor and loyalty of his following.
It is only when a conservative realizes that Trump is not the “Chosen One” (another thematic exageration for iillustrative purpose) that the conservative can reject Trump as the “Supreme Leader”. Even when a conservative can do this, they can often be bullied into falling back into line, which explains why many conservatives must abandon conservative values and beliefs before they can wholly reject Trump.
Until the majority of conservatives reject Trump in general, Trump will retain his grip on the Republican party, because he retains his authority. When you hear from your friend again, you will likely have to continue as you have been, reeducating him as you go, risking that you might lose this friend permanently if his conservative peers convince him to forsake you as a friend.