Plastic chargers, tacky?

Unless you have really picky guests, the plastic chargers would be a nice option to go with your color scheme. They should primarily notice the dishware anyhow.

Since chargers don't perform a function and are just there for looks, I do think it would be better not to have any at all, rather than use plastic ones, assuming the rest of your table setting is "real" (i.e., not disposable).

Now, it's true that your guests might not notice, but simpler is usually better when it comes to decor anyway, so just save yourself the expense and don't have any chargers.

I would agree with Maggie- plastic chargers are an added cost and if not great quality, they can look tacky. I would think about your event formality! If the event can go without them, I’d recommend forgoing plastic ones.
That being said, we’re personally having a fairly formal event and it would be odd to not have them. We ended up finding 110 silver chargers on Amazon through a third party seller for a decent price and good quality. Much of our accents are silver metal/mercury glass so these fit with our theme