Generally it's no zippy one-liner putdowns, more than no humour. I think the general idea is that if you want to criticise something, you should directly write out an argument against it.
In this case the joke wasn't even related to the discussion, since neither Signal[0] nor Telegram are self-hosted anyway.
[0] You can sort of self-host Signal, but last time I looked there was no way to change the URL in the client without rebuilding it, and it's not federated, so that's pretty pointless unless you also get all your friends to install your new version too.
Some people are shallower and less humorous than the others, and can't get the reference and joke where others can. I am fine with that, not that I want to be king of HN with best karma of them all. I just like to hang around bright humorous people, not shallow smugs.
The discussion was about some people getting offended because some other people don't have whatsapp accounts.
I selfhost xmpp (ejabberd) and matrix (synapse) servers for my friends and family. When someone asks - and this happens fairly often - how come I don't have [insert evil big tech IM company here] account, and how can I be contacted, I say I can be contacted by means of open federated protocol like xmpp or matrix, using open source apps like conversations or element, having account on one of many xmpp or matrix servers, including ones that I administer.
Most people say 'ok whatever man', but some say tell me more and get to get in touch with me.
Because of my knowledge and skill to avoid Evil Greed, and because I am actively working on liberating people from it, I think of myself as a better man than those who argue whether Signal is better than WhatsApp or Viber or whatever. And at the same time I remind myself I am no better than anyone or anything else in the Universe. And I am quite auto-ironic about it.
And what's with all the downmods and downright flags lately? I'm trying to be funny here.