I recall that when I was in high school I tried -- I succeeded in fact -- to avoid using the student bathrooms. At the time I was shy, introverted, possessed of few social skills, and (while we had no name to describe it) faceblind. All of these attributes contributed to my anxiety about the public restroom. But the key issue as I see it looking back was that I feared the judgement of my peers.
We all knew that every guy has a unique relationship with the common bodily functions. On the one hand we all have about the same needs and on the other hand every body works in a distinct manner. We also knew that anybody who differs in some obscure and hidden way beyond the accepted range of variation is subhuman and worthy of being despised. To the extent one was already at the edge of social acceptability one was disinclined to explore that obscure and cryptic boundary of teenage prejudices. We all (or I) assumed that this is how the actual reality game is played and so we each (or at least I) adopted a strategy which we hoped might protect us from the most uncomfortable of the sequlae.
In my case I walked home every day for lunch. At my house no one, and especially no other teenager, was in the bathroom to pass judgement on my behavior.
Nearly 60 years later I find that even in those same student bathrooms in that same high school down the same street from my new house. I am still shy, introverted, possessed of few social skills, and faceblind. Teen boys are still prejudiced and judgemental. The difference is this: I have learned that 16 year old boys do not have very good judgement. In actual reality whatever opinion they form deserves no deference because it is so abyssmally poorly grounded.
Here is the truth about teenaged boys. They are almost all aware that actual reality exists. For the most part they are actively trying to discover it. What they actually have however is something else, something less, something closer to illusory fantasy or rather a series of illusory fantasies which the best of them are trying against events and the opinions of others with the intent of identifying the closest approximations to reality they can find.
The process of teens passing judgement is important but only as an exercise in the apprenticeship for adulthood. The judgement itself is fluff in the wind.