Read the visitor comments on Facebook. Even some Malay Muslims
say they also kena bad service from this organization. So it may
not necessarily be a racist thing.
https://www.allsingaporestuff.com/article/staff-darul-arqam-bookstore-unwelcoming-twds-woman-looking-books-grandchild
On a related note, she wrote : 
"In
Islam, there is no such thing as you must convert to Islam if you
marry someone who is Islam. This rule is set by SEA countries to
maintain the faith and prevent dilution of faith (i may be wrong
but that was what I was taught).".
See, this here, is what I was talking about : with so many
'religious traditions & rules' set by human communities or
institutions for their own reasons, agendas and purposes, the line
is inexorably blurred between what 'God says is right and
necessary' and what 'humans say is right and necessary', all being
lumped together under 'religion'. Religious scholars (of any and
all religions) routinely and will always disagree with each other
on too many aspects. So if the human community (eg. in a particular
country) insists on a certain 'tradition' for instance, under
threat of punishment or worse, can you still deny that it then
becomes part of the 'religion' (at least for pple in that
particular country)?
If you've understood this post, you'll know that it isn't
directed at any 1 religion in particular, but rather towards
religion in general : merely pointing out the truth about the human
condition which few people realize, understand and acknowledge, or
are willing to realize, understand and acknowledge.