I'm using MySites and also use the Social Features on a couple of sites. But on one of the lists I needed to hide "Tags and Notes" without deactivating the farm feature. I used this CSS for it:
<style type="text/css">
.s4-socialdata-notif
{
display:none;
}
#Ribbon\.ListItem\.TagsAndNotes
{
display:none !important;
}
</style>
This "#Ribbon\.ListItem\.TagsAndNotes" will remove the "Tages and Notes from the Ribbon:
You can find the ID via IE Dev Tools:
