I obviously don't know anything about you beyond this comment but you chose to include a mention of your divorce, so I think it's not overstepping to try to connect these themes. To be blunt, could it be that being less dull would have improved the longevity of the marriage?
> in fact when I try to amuse my colleagues or the opposite sex, my jokes regularly fall flat
Even the dullest of innocent jokes, delivered horribly, can get a chuckle in decent company. "Falls flat" means the "jokes" are inappropriate, mean, gross, *ist, etc. The phrase "colleagues or the opposite sex" is a tell.
You know nothing about this man. Please don't judge them based on a casual comment in a forum. That's cruel.
[flagged]
Are you trying to imply that you know this person? That your assessment is informed by direct experience of interactions with them in the settings he describes?
If not then the null hypothesis should in fact be that your assessment is anything but accurate.
What the hell is this comment?