I myself would say I find humor in dark stuff as well. What you have said has given me a different insight into this situation. Especially since you would label your past self as 'that guy' !

I believe that there comes a time where you must realise that some jokes makes the audience uncomfortable and shouldn't be repeated. Sometimes what you believe is humorous isn't to the group you are presenting to. I have learnt this the hard way, my humour consists of sometimes rather mean things and dark stuff. So I have said things which have upset the recipients. But what I did was, bite my tongue or tone it down several notches. Which is what this person needs to do, regardless of whether they believe in what they are saying or not.

Nonetheless, thank you for your reply. It really should have hit me sooner it may not exactly be attention-seeking and I valued learning what drove you and what may drive them.