Your question is valid and I want to give you answer of your question.
Can you find the verse in Bible where written that wearing tie is haram or it is the sign of Christianity?
Wearing of tie was introduced from Bosnia. In Bosnia, Muslims lived in this place. Any culture which are against our Shariah, it is haraam.
Let me give you example that Arabs wear tops and Christians also wear tops.
Then according to your point of view the tops are haraam or it is the sign of Christianity.
So, definitely tops are not haraam or sign of Christianity then how you say that tie is the sign of Christianity or haraam.
It is Mubaah. Mubaah means if you like it you can wear it and if you don't like then you can't wear it. It is your choice.
It is the misconception of some Muslims that wearing tie is the sign of Christianity.
Allah knows better.
I hope you satisfy with my answer.
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Dr Zakir Naik's Answer