I don't it's trivial. It's a matter of life and death. But my death and my life. It's not that I don't have an answer, but I don't like feeling interrogated. :)
This isn't an interrogation, but you said some things which I think deserved critique. Just because you have an opinion doesn't make it so, nor is it something that should be respected. You don't have any legitimate reasons to say these things so you hide behind opinion as if because it is an opinion it's above scrutiny.
I guess I think that choice of car brands is trivial; maybe it wasn't a great example.
Thinking about things is really important (and this isn't just a personal matter or a matter of taste, but a matter of what is true and what is false). But I CERTAINLY agree that nobody ought to be forced to have awkward conversations, this is why some places have long standing traditions like "no religion at the dinner table" (and, for that matter, "no proselytizing by public school teachers")