The Queen of Persia-
Is Torah Vodas an option?
I don’t think the high school learns in Yiddish, but I remember it as being chasidish / litvish.
FYI in the non-chasidishe yeshivos I went to, by the time boys are 17 they are usually accepting of those with different levush and minhagim, and don’t pick on or ostracize them.
I can empathize with you that it’s not easy – I wish you and your son much hatzlocha.
Joseph-
Tizku lemitzvos.