Why would it source it? You are not running true
$ echo $SHELL
In most modern systems
sh is a symlink to a basic shell. On my Debian for example:
$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Aug 1 2012 /bin/sh -> dash
In your case,
sh is a link to
bash but, as explained in
If bash is invoked with the name sh, it tries to mimic the startup
behavior of historical versions of sh as closely as possible, while
conforming to the POSIX standard as well. [...] When invoked as an
interactive shell with the name sh, bash looks for the variable ENV,
expands its value if it is defined, and uses the expanded value as
the name of a file to read and execute. Since a shell invoked as sh
does not attempt to read and execute commands from any other startup
files, the --rcfile option has no effect.
Do not read and execute the system wide initialization file
/etc/bash.bashrc and the personal initialization file ~/.bashrc
if the shell is interactive. This option is on by default if
the shell is invoked as sh.
So, since your default shell is
.bashrc is not read. Just set your default shell to bash using
chsh -s /bin/bash.