Even as a Spurs fan I don't really want to see a pen given for something so silly and inconsequential, even if by the rules it should be a pen. I've seen similar happen at free kicks before and no one cares.
If you're sending Maddison off there then you need to send Yates(who was already on a yellow) off as well for doing VAR signs to the ref, really should be doing that regardless of Maddison actually.