You think it reads as casual, mellow, "like, whatever, dude... It's all good..."

But actually it reads as an eye roll, impatience mixed with passive aggression, unwillingness to be direct. It sucks to receive an ellipsis. End your sentences, and do so confidently, so people will know what you mean.

An ellipsis clown:
   I do not know what it could mean

from The form of the book: essays on the morality of good design, ᔥ Charlie.

AuthorJon Mitchell