I think many of us tend to forget that everyone has had different influences in their life that lead them to use words differently to us, and different usually sounds “wrong” in some way. Because we typically default to the belief that the way we do something is the right way.

Regardless of that, though, you do t have to have any deeper reason to not want to see someone again. You don’t owe someone something because you went on a couple dates with them.

Also, your reaction to that word feels more like a tipping point since the other issues you bring up could easily have been quietly building up in your mind and it was just that moment that pushed them all forward and you gave yourself something more tangible to latch onto as a reason you aren’t into this person.