There is a draft specification to allow threading messages: https://ircv3.net/specs/client-tags/reply https://ircv3.net/specs/client-tags/reply Not many clients

There is a draft specification to allow threading messages: https://ircv3.net/specs/client-tags/reply https://ircv3.net/specs/client-tags/reply Not many clients are interested in implementing it, though.