You can't know that. You can only assume.
If there was a way to identify who is ignoring you it would likely cause problems within the community. From my experience people generally hate being ignored, and would likely create a new account just to confront the user who is ignoring them which would just cause unneeded drama, and harassment within the community. If a user wants to ignore another user then they should be able to do that with the upmost privacy.
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Have to agree with this. Anyone should be able ignore anyone in the privacy of their own pc/home.
First of all, thank you all for your quick reply. I was thinking something like this but I still wanted to know because it might not be known to me.
Anyway, since I read the comments above and realized that this is impossible and I have got the answers to my question, So I am locking this topic now. Thanks again.