I've had some particularly weird and varied gig-going this week. If you could draw a Venn Diagram I doubt if there is anybody else in London who has been to the same shows as me. Wednesday night was particularly odd. I don't think I've ever been to two more diametrically opposed events.

First off I caught the early performance of Jake & Amir at the Soho Theatre. I then went to see a circus performance by Australian combo Circa, backed by a renaissance vocal group, in a church near Smithfield market. At the first event I was probably the oldest person in the audience. At the second I was among the youngest.

It struck me afterwards how the comedy business seems to be splitting up into tribes, with gigs by and large attracting different demographics, often without much crossover. In her new book Viv Groskop recalls doing a spot at an "urban" comedy night – a euphemism for black comedy. She was not only the only white person onstage, she was also the only white person in the room.

This fragmentation is everywhere. On Tuesday I'd been to see the live version of Mrs Brown's Boys at the O2 Arena. The audience was strikingly mixed age-wise, from grandparents to kids, but at the bar during the interval overhearing the accents it sounded as if the entire population of Kilburn had migrated to Docklands for the night. Mrs Brown onstage seems to attract anyone with an Irish ancestor. I wonder if Barack O'Bama is a fan.

Yet I'm quite happy to be a comedy chameleon. I've got preferences of course, but I've also got broad tastes so I find this kind of self-imposed segregation difficult to fathom. If it's funny I'll go. But I get the impression that while music has become more open-to-everyone, so that you get kids enjoying the Rolling Stones at Glastonbury or rock fans enjoying Kanye West, comedy seems to be splitting into smaller sub-sections which barely overlap. I wonder if any of the cool crowd that goes to the Invisible Dot to see Tim Key or Simon Amstell would ever go to see Michael McIntyre. As for the oddballs that will be attending the Weirdos Bowie tribute this Saturday in Kings Cross, how many of them will be booking tickets for Micky Flanagan?

These sub-genres such as Invisible Dot and Weirdos, along with The Alternative Comedy Memorial Society, are currently making comedy more exciting than it has been for ages. It is the punk-style reaction to the Live at the Apollo boom that I predicted would happen a few years ago. And as with punk there seems to be little time for any cross-fertilisation. If you are part of the ACMS you presumably mustn't be seen dead at a Lee Evans gig.

Perhaps it is because these lines are so distinct at the moment that Jimmy Carr was given such a hard time at Josie Long's Arts Emergency fundraiser last week. As one of the hecklers shouted, "you're not one of us". I assume they meant it in a political sense, but it also resonated with the idea that Carr was not part of any so-called alternative comedy scene any more.

As for me, I'm going to keep going to all sorts of gigs. Just don't tell anyone at The Invisible Dot if you see me at Micky Flanagan later this year.