You make it sound like I only care about my own healthcare. I was in favor of universal healthcare before I needed it desperately. I am not going to let someone die of a curable condition to give someone like Trump a tax cut. You make it sound like a trivial matter. It's literally life and death for tens of thousands of Americans.
If you're going to vote for and support a man whose policies may literally kill your friend then you are no friend.
Let's see how that he votes when he gets a preexisting condition or two though.
The failing in this line of thinking is, I think, that it presumes that you can assume another voter's democratic rights are subject to your own interests, and that failure to vote in accordance with your interests ends any further dialog because you have "unfriended" that voter.
While I can see that you might well be angry with someone for voting for a manifesto which promises a negative impact on you, I think it is more helpful in the long term to try to understand their motivations and then to persuade them to change their mind. For instance, the voter might have voted for Trump because:
* He/she didn't approve of the less assertive foreign policy pursued by Obama and promised by Clinton.
* He/she holds socially conservative views which he/she thought Clinton attacked.
* He/she thought the anti-regulatory, protectionist, and tax-cutting economic policies promised by Trump would be beneficial for jobs and/or growth.
* He/she didn't feel that the Washington "establishment" of which Clinton was a key figure represented him/her, and so voted for someone who professed to loathe it.
* He/she believed that Obamacare was expensive and chaotic, and thought that it would be better repealed and replaced.
You might scoff at any of the reasonings above, and for the most part I would join you in arguing that they were misconceived or at least oversimplified. But measured against the supposition that your friend voted for Trump because he or she wanted you to be deprived of healthcare, each seems more plausible.
If we accept that, then we also have to accept that your friend didn't appreciate the consequences of voting Trump for you personally. He or she might have been callous, thoughtless, confused, ignorant, or simply wrong; or he may have had an even more compelling reason to disregard your circumstances in favour of others. In any of these cases I would argue that expressing your hurt and anxiety to your friend and imploring him or her to think more carefully in future may achieve a double benefit of retaining a friend and losing Trump a reelection vote. As it stands, you seem to have lost a friend and potentially to have entrenched a vote for Trump.
Again, I genuinely do sympathise with your circumstances, but in my experience moving someone from the "friend" to "enemy" column is hardly ever beneficial to anyone.
