Well it made me well up with tears. I agree it's intense but I think you are supposed to feel a sense of unease at the beginning. It hints at a message of loss and distance. They've obviously had a falling out, or life is now a series of fallings out, as if often the case with teens.
The dad no longer understands his son and feels sad that his little boy has gone and been replaced with this 'man' who is always combative, or secretive or surly. They have lost the the ability to communicate without it descending into one or other of them feeling disrespected or misunderstood.
The dad feels rejected and worries that his son has become selfish and dismissive of him. Classic coming of age, parent v. teen dynamics.
The boy has put an awful lot of thought into that gift at a time when his dad probably feels he's incapable of thought for anyone but himself.
I think it's a powerful way to say how much he loves and respects his dad, at a time when he might struggle to say it in words. I loved it.