Adopting a generally cocky attitude — claiming to be high-value, attractive, or better than the other person at something — works as an easy substitute for scripted teasing. It forces the other person to either accept the high-value frame or contest it, and that acceptance/contest dynamic itself produces tests, banter, and emotional spikes without needing a specific pre-written tease.
Unlike a canned line, cockiness works indirectly: the guy doesn't need to invent or deliver a specific tease, because the frame he's asserting does the work of generating pushback and banter on its own.
This is one of two "easy substitutes" for teasing skill named alongside canned lines — cockiness supplies attitude without content, canned lines supply content without requiring improvisation. Both sit inside the broader Flirting as an Attitude Decision (Premise + Tease Framework) framework.