If you can smell a fart through underwear and pants...what makes you think a mask will work? But I’m not opposed to someone wearing one if it makes THEM feel better

sure thing little buddy
A fart is composed of gas, primarily co2 and methane. Methane is a lifting gas, which means it's less dense than the air, so it doesn't just fall to the ground little guy. Imagine a little methane particle just floating in the air like it's sitting on a pool floaty. That's who it's able to travel from one person to another, it floats
Covid is transmitted to through droplets, which is a liquid albeit a tiny little invisible liquid. Now these droplets come in ALLLL different sizes, but they're heavy, but since they're sooooo tiny when they're expelled from your body they shoot like it's coming out of a cannon that's called inertia, but it's not forever since the earth has an atmosphere and there's friction and gravity. those are our friends, can you say friction big buddy?
So when you wear a mask you get the filter out all the biggggg bigggg droplets, and when you combine it with standing 6 feet away the tiny ones pass through the mask gets a chance to fall to the floor and that way you dont get any yucky germs