Earlier quoted context omitted.
It's not about forgetting or being "too used to it". Wearing a mask while doing a two minute bike ride between buildings is literally the most rational option. Think about the time it would take to get out your backpack, pull out your mask case, etc, etc. I don't know why you are assuming they are wearing a mask for safety reasons when there is a much stronger justification right there. Seems like motivated reasoning…
That was the point of the second paragraph of my post. The point is we would laugh at someone who wore a helmet in an elevator for their safety when riding the elevator. I assume some students are wearing masks on bikes because they think if they do not they are at risk.
Which is a blind and unjustified assumption based on no data, especially when there are much more legitimate and likely reasons for those students to wear masks when biking between classes.