Getting mad / beating racket after loss

My 16 year old is a junior player. He played a kid tonight his age in a singles match. They have close utrs. My kid won. Close match. All during the match the other kid had an attitude. He huffed and puffed. He threw his racket hard on the mat. He beat his racket with his fists multiple times after losing a point. ( like punching his racket 8 times hard)

My son versed him recently in a close singles match and lost but tonight he won. My son was paired with him before thier singles match in a doubles today also. He said nothing to my son.. no like...hey good shot comments or racket clinking. Just ignored him and not acting like a teammate.

We're proud our son is a good sport. I think we can all get emotional but kid was pretty emotional. Let's all have fun right?