Keep the tie, I would just never wear it, which I even stated was my opinion, which is up to you in how you interpret. I don't personally like the tie, but seriously more power to you if you make it work in your fits.
I'm sorry I don't have 10s of thousands of posts of good fits on this forum, but that it doesn't change the fact that, in my opinion, (take with a grain of salt if you feel that it's too personal) the entire fit looked good, but the perspective makes it look flat without some texture.
I wasn't taking issue with your critique, which has merit--a grenadine or knit would have been a more technically sound choice. Rather, I objected to the way you framed it--i.e. that not only was the tie an affront to good taste, but that I needed to immediately dispose of it, then go out any buy some replacements because there was no way I could possibly own any ties that would complement a blue jacket/fawn trouser/blue shirt look. You are by no means the only poster in this thread to adopt this tone, and it's a part of the "institutional culture," but I don't think it's needed to render a useful, direct critique. That's all I was saying.
I'll own that I'm sensitive with regard to this tie because it was a birthday gift from my partner. This doesn't mean it's above criticism, though! Thanks for the compliment about the rest of the fit.
P.S. Please do post a fit or two.