cannot remove com.skype.skype.shareagent.plist I am on High Sierra (MacOS 10.13.6) and I am failing to remove com.skype.skype.shareagent.plist which is in ~/Library/LaunchAgents

ls -l
-rw-rw-r--@ 1 me  staff    1  8 Oct 17:57 com.skype.skype.shareagent.plist


So I fail to see why I cannot.  Yet:

rm -r com.skype.skype.shareagent.plist
remove com.skype.skype.shareagent.plist? y
rm: com.skype.skype.shareagent.plist: Operation not permitted


similarly, 

sudo rm com.skype.skype.shareagent.plist
Password:
remove com.skype.skype.shareagent.plist? y
rm: com.skype.skype.shareagent.plist: Operation not permitted


I rebooted in single user mode, used chflags noschg and tried to remove the file with no success.  What I did manage to do as single user was to basically delete the content of the file with vim.  I cannot rename the file BTW.

Any idea of (1) what is going on and (2) how I delete said file?
Well I realised the folder ~/Library/LaunchAgents was locked -- I changed that and I could remove the file.  Mystery solved.