Did I found a bug in "ls"?

[Major Péter]

Hi!

I would like to list some folders with they block-sizes, but only 
specific folders am I interested.
So I would like to use find to list the correct folders for me:
ls `find . -type d -user foo -name "*"`
this is not working because ls can't find folders with spaces in there 
name, so I am using a pipe and sed, to make it comfortable:
ls `find . -user major -type d -name "*" | sed 's,\ ,\\\ ,g'`
If I'm using echo instead ls, the output is:
./foo\ bar
So I tried to use:
ls ./foo\ bar
And it worked!
The easiest way to check this is using this command in a folder where 
are folders with spaces in they names:
ls `ls -a | sed 's,\ ,\\\ ,g'`
Is there may an other way to find out the folders block-size belonging 
to a specific user?
Thanks for your help.

Regards,
Peter Major