We see this sort of celebrations in a lot of sports. Players' get caught in the momentum.
Nigerian tabel tennis star Onaolapo was so overcome with emotion that he decided to pull his shorts down.

Some of Mohammad Ali's quotes are downright cocky (the ones below) but people like him so much that they tend to overlook these quotes. Actually I don't dislike them either. Somehow it suits him (very Godlike).
- My only fault is that I don't realize how great I really am.
- I am the greatest, I said that even before I knew I was.
But you get the point.
And people choose how they feel about it. Some people may like it, and others may not. It's a wash. Who cares?