I know, we talked about this five years ago. Well, here's the current auto-tags:
lowres (less than 500x500)
highres (at least 1600x1200)
absurdres / insaneres (at least 3200x2400)
incredibly absurdres (any dimension over 10000)
huge_filesize (at least 10 MB)
At this point 'absurdres' / 'insaneres' is just 4K high res, not absurd at all. I've got a cheap Dell 4K monitor and so do a lot of other people - and more to the point this size of picture is very common now on artist sites. 1600x1200 is not 'highres' at all any more, it's pretty standard.
Maybe it's time to just start tagging them with standard display sizes - HD is 1280x720 (or up), FHD is 1920x1080 (or up), 4KUHD is 3840x2160 (or up), 8KUHD is 7680x4320) or up. Those won't change over time.