lmao nah... there's a good chance a lot of this is on point. Especially when people have mics on and you can hear the salt during the match
Even if it is, why does it matter? Does this affect the health of the game or your enjoyment of it in some way? It is Kasual, after all. Ultimately people play for their own reasons, if they don't want to rematch because they don't like the matchup, want to fight more different characters, or have to go get some food out of the oven it's none of my business. Rematch is an option, meaning because it is optional: they can play the game how they want to, unwritten rules are for dorks.
I've won
maybe 15% of the few matches I've played so far, and I'll rematch anyone endlessly until they get sick of wiping my bloody pulp off their knuckles. I find no reason to try and intuit why that guy didn't want to beat my shit down for a 7th time in a row.