He is goofing off on company time.

No other facts are needed. The fact that he was goofing off on company time alone is enough to justify him being fired. Just because most people goof off on company time without getting fired is of no consequence.

When you violate the law of common sense, reason, and fairness, you open yourself up to consequence. When those consequences hit you, you either face them like a real man, or you cower like a baby.