Seems pretty simple to me. We deserved a point because we scored 1 perfectly legitimate goal, and they scored 1 perfectly legitimate goal.
If our goal was a super dodgey penalty/lucky deflection etc you can say we didn't deserve it. Along with say if we were disallowed an offside goal that was clearly onside we deserved to win.
As far as im aware none of these events happened.
Spurs were clearly the better team, but Foster was the best man on the pitch, every chance he saved and conceding just one goal was earned by him.