“There are three types of people: reasonable people who agree with me, crazy self-identified fascists, and lily-livered wimps who can’t pick a side!”
If someone says that they are “centrist” they are not telling you that they base all of their opinions on being in the middle of any two positions. That would be stupid and is an insane argument to put forth on your part.
They are telling you that they agree with neither major party on everything, and find that both parties have views that they don’t agree with. It’s pretty easy to come to that conclusion because the US two-party system packs in an almost incoherent mishmash of beliefs into exactly two sides.
There is absolutely no contradiction in being for police reform, and against riots lasting for days. There is no contradiction in being for gun rights, while also wanting limits on them. There is no contradiction in wanting functional government services and universal healthcare, and thinking that free markets are effective. There is no contradiction in wanting a more balanced budget, and government services to be funded.
The idea that there are only two (or maybe 2.5 depending on where you live) sides in politics is a strange delusion created by your two party system.