the.com/cup of tea

means Something that suits your particular taste — usually used in the negative, to politely say something isn't for you.

from Tied to Britain's long love affair with tea itself: by the early 1900s, calling someone or something 'my cup of tea' meant they were exactly to your liking, as comforting and personal as your own preferred brew. The phrase likely grew from earlier expressions praising a pleasing person as 'all tea' or similar — tea being the household standard of agreeable warmth. The negative form, 'not my cup of tea,' came slightly later and is now by far the more common use, perfectly suited to a culture that prefers understatement to outright rejection.