Is the expression "see you when I see you" impolite? [closed]

I agree that "See you when I see you" isn't the friendliest of phrases. You should probably say something like I don't know when I'll see you again. Soon, I hope.

Here in Taiwan, the native speakers of Chinese usually say See you next time for what literally translates to "again see" (再見) (zai jian). The vagueness of "next time" makes it almost work for me.

See you later!
See you again!
See you soon!

These are three reasonable substitutes for "See you when I see you", and none is rude, just vague but positive.

The sentence in the first paragraph is somewhat formal and not appropriate for everyone, just people you'd really like to see again soon but don't know where or when it'll happen.

I wouldn't consider that to be impolite at all, however if you are dealing with one or more people who do think that, the phrase "See you later," or "Catch you later," or maybe "I hope to see you soon" may suffice.

There is a great Australian movie called Gallipoli (about WW1) where two soldiers have this exchange: "I'll see you when I see you" and the other responds: "Not if I see you first!". In this case it is humorous, and a sign of friendship, so I guess its dependent on the culture.

"See you when I see you" is very cautious, not too demanding nor pushy and not even asking permission or approval to other person. It's not said in an obligating manner; it's a very safe statement and non mandatory, though hoping for the other person to agree if he/she is interested to see him/her the next time they'll meet.