Two rivals meet each other. One points to the other. The appointed man proceeds:
1: Howdy
2: Sup
1: Yo
2: Hey
1: Sup
2: Hello
1: Hi
2: Hullo
1: U! (Person 1 gestures in a U shape, received by a skeptical glance)
2: Howdy
1: Ho!
2: Adios
Person 1 looks surprised briefly, thinks a bit, then looks sad and say "I will get you next time" and walks away dejectedly.
After days of scheming person 1 believes they can triumph and plans to encounter person 2.
1: Hola
2: Hello (quite smugly)
1: Howdy
2: Hiya
1: Hullo
2: Madam
1: Heya
2: Wuzzup
1: Shalom
2: Ahoy
1: Salute
2: Hello
1: Morning
2: Greets
1: Welcome
2: Dagnabbit. (Person 1 looks expectantly. Person 2 sighs) Fudge
1: Goodbye
Person 1 smiles as he walks away victorious.
What happened?
Hint:
The rivals are not competing in a way unique to themselves.