It’s called being sensible. Like… We all take risks when we go out, but it’s like wearing a seatbelt. Does it eliminate risk? No. Does it reduce risk and is low risk in of itself by wearing it? Of course.
And ultimately, the insensible thing is banning masks.
It doesn’t really reduce risk much because you’re literally about to take it off anyway in that same space.
If I’m in transit on airplanes and in airports for 8 hours and I wear a mask for 7 of those hours, the one hour (or probably less) that I take off my mask to eat a meal doesn’t completely negate the good that wearing a mask does for the rest of the time. I’m still reducing my risk (or the risk I pose to others around me) for 88% of my travel time.
I’m going to take a wild guess that the infectious disease doctor knows better, but by all means please proceed, Mr. Dunning-Kruger.