No, he's stating it's not serious because, as far as I can tell, you are the only one really taking it seriously. Almost everyone else is having a laugh at your expense.
Jokes made at your expense keep flying over your head. Thermal's continued insistence on calling you brother is done to take the piss out of you, and you seem to be completely oblivious.
I'm reminded of the gathering at my aunt's house many years ago where a couple of her MENSA friends made an appearance. Any conversation on any topic, they were "experts". They totally failed to notice that nobody was taking anything they had to say seriously, and half of us were doing everything we could to make them look like fools. Not that it required much effort on our behalf, because they were doing a pretty good job of that all by themselves.