I mean at your level blundering a queen for no compensation doesn't mean it's not still anyone's game.
It's called "I disrespect my opponent because I believe he's stupid".
By not resigning, you show that you think he's going to screw up, which translates to "you are stupid and I'm going to let you suffer 'till your idiocy f**ks you over".
With bullet chess, it's standard practice not to resign and trying to flag the opponent. Especially the fast bullet like 1 min with no increment....
Well, it is bullet, a mode where making a mistake is pretty common among all players due to the short time, so it makes sense to not resign in low time controls.
However, in longer games...