i agree 
and i admit im one
too.
i think it boils down to a few reasons. i have this feeling( may
not be entirely right or applies to all) that this kind of reaction
has something to do with face. im not sure how right i am but
sometimes i do feel that way. its because we as singaporeans are a
bunch of attention-unseeking people so we try not to direct
attention to ourselves. by going out of the way to help someone
else, we may be somewhat directing attention to ourselves and
people will tend to look at what we are doing. for example if we
give up our seat, then pple will look at us that kind of mentality.
worse still, if we kana rejected, then its kinda embarrassing, so
we rather not do it. that's what i think, not sure how true it
is.
or another reason, is the nonchalence of singaporeans. some
singaporeans have the thinking that other people will do it, so why
me and it ends up that no one does the job. like one instance i was
on the bus to school and there were many of us alighting at the
same stop but noone pressed the bell when we were approaching the
stop and in the end, all of us missed the stop. it turned out that
everyone thought that someone else would press the bell and in the
end, no one did and all of us, from the same school had to walk
back one stop.
maybe singaporeans are selfish people. ill admit that im one too.
we get a seat and we want the seat, even if someone may need it
more than we do. like i sometimes, feel like not giving up my seat
because i just feel like sitting down.
just my one cent's worth 
