Just the opposite. Someone leaves a fart in the aisle, it doesn't matter from which direction you walk into it. This one way aisle thing is just more theater and virtue signaling.
That’s one spot, not a trail behind them like if they are constantly breathing out that you are walking through continually.
It’s one instantaneous exposure vs a continuous 20-30 minute exposure.
Walking behind someone and breathing in whatever they are exhaling is going to leave you a far greater exposure than passing through one isolated spot.