Having spent time with David's family on Sunday, I would guess that his action was all about youthful compulsion. He was excited about being back in his home area, playing in front of so many friends and family and reacting to the excitement of scoring a touchdown in front of the woman he loves.
Guys thrive on "atta boys".
I for one, commend him for having the balls to show his love for Kelsi in front of everyone.
I don't for a minute think that he is a "drama queen".
Just sayin'