To onlookers it's very unclear what you're actually arguing. I believe that the other two are arguing probably some variation but I am pretty sure that nut hugger is arguing about population spread and you're arguing about individual protection. Right?
I suspect you are arguing past each other.
Masking limits viral spread. Sick people should be wearing mask even outside of this pandemic.
Universal masking in a world of asymptomatic spreaders is better than just masking the symptomatically ill. That's due to our limitation in further technology, but it works given our current circumstances and limitations.
The inoculum theory remains and is suggestive of being true in that very paper. That is, you spread around a lower viral load especially in high density areas while wearing a mask. If you get somebody sick, those around you are less likely to have severe illness because of a lower initial viral load and subsequent inflammatory response. That's the theory and there's some developing data suggestive of this.
They then reference data suggestive that this is the case but it is not a study just a review.
When you say wearing a mask does not prevent infection, that's a very ambiguous statement given the above. Wearing a mask absolutely unequivocally prevents covid19 population infections when counting number infections with mask or without masks.
You seem to be arguing about an individual wearing one mask and going about their day and wondering if their ability to catch the Rona is zero. It is not but that doesn't make your statement accurate to the conversation above where those two were arguing about whether mask "stop Rona" or "do very little".
Masks limit spread and with that you have a lower population rate of cases.
Masks Do not have strong evidence of protecting the person wearing them from incoming viral droplets. They do limit The amount of incoming viral droplets. Well people probably don't get much benefit from masks. But given the lag time of symptoms it has proven an effective measure to attenuate the asymptomatically ill.