So up until I married, I genuinely thought that certain cups being for tea and others for coffee, etc. was a common practice. I myself have an (admittedly extensive) hierarchy of mugs/cups to be used for each drink. The breakdown is as follows:
Tea should be made in Particular Brown Mug (I have two).
If brown mugs are not available, tea may be made in either of two thin-walled Floral Mugs.
If these aren't available, tea can then AND ONLY THEN be made in one of the Taller White Mugs (we have eight).
If none of the above is available, an emergency dishwasher run needs to take place immediately, and in the meantime one of the bone china tea cups will come out with much fanfare (bone china not being toddler-compatible, they come out but rarely nowadays).
There's a similar hierarchy of coffee mugs. Juice and water also have particular cups, but they're not quite as stringently enforced. DH knows this and accepts it.
The problem is that DH has no Special Mugs. None. He has no issue whatsoever with my hierarchy of tumblers and has even painstakingly learned which ones to grab in various scenarios when he makes the drinks- but he doesn't have a mug that HE prefers. When I ask if he wants tea/coffee I have no idea what to give it to him in.
Wondering if he just hadn't "found the right one yet", I went ahead and purchased a Potential Special Mug for him as a present (he had been dropping hints that he wanted it) and he does like and use it, but refuses to insist that it, or any other drinking vessel, only be used for one particular beverage to the exclusion of all other mugs. I, coming from a long line of Special Mug lovers, find this lack of commitment odd.
By way of comparison, my DF still uses the same Special Mug that he's been drinking from for the past two decades. Even my DGPs each had their own Special Mug marked with nail polish in an inconspicuous spot to differentiate between the two identical mugs so they could tell whose was whose. AIBU to have a Special Mug, and provisions for when the said mug is unavailable? 