I'm in a red state and no one has said anything to me,

Yet.

“Science Not Morons”. It gets some looks but nobody has picked a fight, yet.

Remember those metal pin-on buttons everyone used to wear? I've never cared for bumper stickers: you speed by them (either agreeing or disagreeing, if you read them at all), and when people get out of their cars (do they ever?), their message is lost anyway. And because ... cars.

Plus the issue mentioned in the OP: you can get your tires slashed. It would take a real brave bully to punch out an old lady wearing a Black Lives Matter mask or button, or even a Biden mask or button.

We used to wear our political preferences on our lapels, bravely and humanly. Goodbye to bumper stickers on anonymous cars in a parking lot, imo.

are plain, but the other day I saw a black mask I liked and I got the idea to put whiskers on it so I would look like a cat. I knew someone else had to think of this first, so I checked Etsy where I found lots of cat masks, but none that were what I envisioned. I've figured out how to do it; I just need to get the black mask and some felt.

Might as well no matter what the party

I would wear a campaign mask if I was out working for a campaign, for the same reason that I would wear a campaign tee shirt.

Other than that, I prefer not to put anything political on a mask.

Trust Science not Morons
Fuck Trump and the Russians he rode in on
Disaster Movies All Start with Government Ignoring Science
1 in 3 Trump Supporters are as Stupid as the Other 2

and my favorite, a red one that says:
IT HASN'T
BEEN GREAT

If I did need to go somewhere that I wouldn't wear one of the above, I have "Will Remove for Wine" and "Sarcastic Comment Loading, Please Wait" with the status bar

So far, even in rural red areas, good comments on them.

and that is going to escalate.

In our heavily red areas it would be tantamount to inviting someone to vandalize our faces. A darned shame, because this is a little way to make some" good trouble," but we won't be able to for the same reason we don't display bumper stickers: can't afford the repairs.

A friend thought I'd like a cute mask with tea pots all over it, so now I'm wearing tea pots on my face. Maybe its very normality could serve a civic purpose without being seen as a threatening political statement? Yeah. "Maybe" I just want to feel I am making a positive statement without risking being punched out.

We worry about it all the time if we're wearing a controversial mask.

I've posted this idea before, but it bears repeating. Are Republicans the same species as the rest of us? Do they have a missing gene? Are the parts of their brains that contain empathy missing? There's no doubt they are different from us. And there's certainly no doubt that they are a danger to our freedoms and our democracy.

Who would have thought that their ignorance, pettiness and maliciousness could be reflected in something like masks?

In any event, we're stuck with them as about a third of the population, and all we can do is everything possible to prevent them from holding political power over the rest of us.

especially lacking important traits needed in the modern world. Their dark view of human nature, fear and hostility toward change and differences, oversimplification of everything, dishonesty to fit the world to what they want to believe, and, usually, desire to have a strong leader who will decide matters of right and wrong for them (!) make them very dangerous with power. As we're seeing.

Don't know if you read Bob Altemeyer's description of what happened when they gathered some strong RW authoritarians to play a "world domination" game. It's a hoot. The various groups' decisions were to be studied, but they blew up the planet so quickly that the psychologists had to interfere and start them over more carefully with more instruction. The second time it took them a bit longer to launch global nuclear war. (Liberal groups playing the game set up a united nations to try to settle conflicts short of war, etc, etc, and did a fair job of creating general peace and prosperity.)

To be fair, not to forget the hard right's counterparts on the far left, also given to zealotry, the dishonesty required to sustain beliefs not supported by reality, and excessive loyalty to strong-man leaders. But they're far less prone to violence and most troublemaking's confined to the left.
But, if bad leaders manage to unite right and left extremists against the middle (as Putin was reportedly hoping to do), Katie bar the door!

We really have to restore the ability and desire of sensible people on right and left to form a controlling majority when the extremes start becoming a threat. For everyone's good. And that does seem to be happening now. If it's not too late...