Avira > young men shouldn’t have to know what to do if their nother is not tznius;
This example came up to my mind from the question a bachur asked Hazon Ish, saying that he can not say kiddush (or maybe go home for Shabbat). Hazon Ish explained that mitzva of kibud av vaem is more important and he can simply look to the side when saying kiddush. You can come up with your own examples of bein adam l’havero that most people are not trained in. Should you make natilas yadaim when you would wake up people in process (R Salanter).
Here is one from R Twersky: daughter of Rosh Yeshiva, whose husband is her father’s student. Husband does not eat gebrochts, father does. Should they go visit for Pesach? Maybe eat at a separate table? Answer, qualified as not a psak: eating at a separate table is a problem when we celebrating leaving Mitzraim as families … following a chumrah in the face fo your teacher is a problem, referring to a similar story of Chasam Sofer and two Sanzer chasidim.