I can't quite decide what I think about this.
On the one hand, I can't really be sympathetic to the pernickety policies in both workplace and school which make such a song-and-dance about jewellery, which the religious symbols usually are declared unacceptable within.
On the other hand, there are certainly situations where I think some religious symbols might be considered problematic. The full veil may not be suitable in all work environments where communication is needed. There is also a case for ensuring the religion remains in the private sphere but until Christian religionists accept this, they cannot impose it upon minority religions
But when it comes to a bangle - really, does it cause that much of a problem? It is well known that it is a symbol for Sikhs and it doesn't really cause all that many problems.
I am quite sure if there was a Christian equivalent - something which was considered to be an integral part of following the religion, then there wouldn't be so much fuss made....