There's a sideways discussion going on at the moment on another thread about this.
I've seen it a few times on here where two posters are disagreeing and one of them suddenly starts posting comments about previous remarks the poster has made (often months ago), or picking a tiny selection of threads the poster has started to imply that they're 'anti children' or 'anti weddings' or 'obviously have difficulties getting along with people'.
I remember someone doing this to me on another forum once and it creeped me out. AIBU to think it's horrible behaviour and a really cheap way to try and win an argument.