I'm not responding to everyone, so I'll just put this out there.
Yes, masks work. They work a lot. All but the crackpottiest of loons agree.
The cheap masks are better than nothing to keep you from breathing it in, but that is not what they're made for. The N95's and masks with filters and so on are better at that, but the main purpose of masks are to keep you from passing it on to other people.
One of the biggest problem with Covid from the start is how many asymptomatic people can have it but not know it. That means you, the reader, every one of you, could have no idea that it is coursing through your system right now. The masks are there mostly to stop your nasty droplets and aerosols and whatever potentially-Covid-ridden explusions spew out of you from getting to other people.
Think of them as if we were all walking around, pissing on each other. I can get some protection by wearing pants, but the best way to keep your piss from getting on my leg is for you to wear them. It works like that.
Outdoors, it's usually no big deal. In many shops, no worries. But it's not hard to buy a package of decent masks off of Amazon and keep one in your pocket. If there's a sign on the door or if your Governor or Mayor has used their legal powers to set a ban, then just wear the mask. You and your God-given rights will be just fine.