I think it’s because the brain can’t multi-process as normal so when the thought pops into the head after seeing an old acquaintance like “Wow, have they gotten really fat”, your normal concurrent processing that kicks and says “Don’t say that out loud...” doesn’t kick in and prevent the mouth from operating.
“if he saw a pretty girl, he would just reach out and grab a boob or something “worse”. “
Bush 41 was known to have that problem at the very end.
“if he saw a pretty girl, he would just reach out and grab a boob or something ‘worse’”.
KNOWING he had a ready excuse, there was no suppressing of the urge.