The purpose of cloth/lower quality masks, is to reduce, not eliminate spread. When breathing in, air is drawn around the edges. Thus, if the virus is airborne around you, you'll breath it in.
If you have the virus, and are exhaling, the goal is to stop large droplets of moisture, which carry further, from exiting the mask. They are larger, hence, they get blocked and absorbed by the mask.
Further, when breathing out, air is slowed, and also again passes around the edge of the mask. This reduces the spread, and is also why '6 feet' is recommended as a distance to keep from people.
Again, this isn't about protecting you, but protecting others if you're infected, spreading, and per-symptomatic.
FYI, in most non-US countries ... this isn't a debate. It's just accepted. For example in Canada, politicians of all stripes, left/right/whatever, agree on such basic concepts.
We also didn't have weird things with public servants lying about basic mask protocols.
I'll put this another way.
If you're spreading, and wear no mask? Being a few feet from someone, and talking, isn't going to just get the virus in their mouth. Inhaled. It gets it in their eyes, on their face, their clothes, the list goes on and on.
Masks are about reducing that kind of spread!
Do they help you? A little bit, sure. But thaw's not the point. The point is to protect others!
The cynic in me thinks "What an American attitude. It's all about me, screw protecting others!"