He has just gutted some Lists of beers/breweries, citing some convention that limits these to blue linked entries only, then advised another user to "Please remove those kinds of lists anywhere you see them".
There is no convention of course, that is merely one suggested way to define the inclusion criteria (WP:CSC). Another suggested approach seems like it might be pertinent to this specific type of list....
Of course, one could ask him why he did this, why he ignored a piece of black and white policy (guideline to be technical) and referred to another part of it, an entirely optional part, as a "convention". More importantly, why is he teaching this garbage to other users, who may telling it to other users, etc, etc.Short, complete lists of every item that is verifiably a member of the group. These should only be created if a complete list is reasonably short (less than 32K) and could be useful (e.g., for navigation) or interesting to readers. The inclusion of items must be supported by reliable sources. For example, if reliable sources indicate that a complete list would include the names of ten notable businesses and two non-notable businesses, then you are not required to omit the two non-notable businesses. However, if a complete list would include hundreds or thousands of entries, then you should use the notability standard to provide focus to the list.
But do so only if you like being fed bullshit and generally being insulted and talked down to, like you're the idiot.
There is nothing remarkable about this either. He screws up like this on a pretty regular basis. And people let him get away with it, on a regular basis.