This "Font Size" tooltip is annoying. Does it serve a purpose?

I do not handle annoyance very well, and this keeps tripping me up  The "Font Size" bubble is getting in the way of the font sizes underneath it.   Especially in Firefox, and sometimes in other browsers.  

Is there a purpose?   Of course I'm selecting the font size....except I can't select 14 because the thing that's telling me I'm selecting the font size isn't letting me select the font size!

SharePoint has come a long way lately and I'm starting to really like it.  But this font size bubble is going to institutionalize me.