Most speakers in most situations would make the verb agree with you. But there are attested examples where the agreement is instead with who treated as 3rd person singular. It is less common, for sure, but apparently acceptable for some native speakers.
And, believe me, woe to you who insults the intelligence community, if you're president.
From PBS NewsHour for January 5, 2017, via COCA
Everybody listening to you who talks about one of the great issues in American life today, which is the plight of the middle class…
From CBS 60 MINUTES 2017/09/10, via COCA
If you are doing your job right and attracting the best talent, then it is the entrepreneur who will be choosing you as opposed to you who is choosing the entrepreneur.
From 'The Most Important Job Interview Question' - Anthony Tjan - Harvard 2012, via COCA
We bow to you who is renowned as a Saint.
From a translation by Kurtis R. Schaeffer, in Sources of Tibetan Tradition. Kurtis R. Schaeffer, Matthew T. Kapstein, and Gray Tuttle, Eds. United States: Columbia University Press, 2013. (link)