A cloth mask does just fine filtering most of that. Is it air-tight? No. Does it severely reduce both the volume of respiratory droplets released by an infected person and the distance the remaining droplets travel? Absolutely.
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If you believe that we’re fine as long as we use an everyday mask to block droplets, let me challenge to to spend some time with an ebola patient with only droplet protection.
A) Why would that be a problem? Do you know how ebola spreads? (Hint: It's NOT through the air)
B) Ebola is a completely different virus from SARS-CoV-2. Not even remotely related.
C) When we talk about masks blocking droplets, we're talking about easy steps that can be taken that reduce the risk of transmission. Not to zero, but reducing it by 40 or 60% is extremely helpful and saves lives. And we don't need to shut down the economy or all dress up in full bunny suits to achieve a significant reduction in transmission. Just take a few simple precautions that don't really impact us in a significant way.