m0nkfish
If you see a mask with an outflow valve, it will not be protecting anyone else except the user (assuming they are wearing it correctly, it has the correct rating, etc).
My mask looks like a simple cloth mask but it has replaceable 2.5 filters. Yes it has an outflow valve but that it to ensure the expelled air goes through the filter. I have several of these and rotate them through the washing machine, changing the filters regularly.
I work in the world of funerals and I advise everyone to take all possible precautions - even if they seem unreasonable to you.