Looking on the internet deeply has found these results:

I don't recognize you is the most popular phrase on the web.

I didn't recognize you 1233,000 results on the web	I don't recognize you 1268,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I... I didn't recognize you. I didn't recognize you when we spoke yesterday at the refugee center. I didn't recognize you, General. I'm so sorry I didn't recognize you this morning in the lobby. Agent Hardy, I didn't recognize you. Samantha, I didn't recognize you! I didn't recognize you yesterday at the crime scene. You always had a beard, that's why I didn't recognize you!	I don't recognize you... but for some reason I don't understand... when I see you shedding tears... my heart aches for you. I know your face but I don't recognize you. You look at me so appalled, 'cause I don't recognize you at all. I don't recognize you, Pandora. There must be some mistake here. I don't recognize you. I don't recognize you anymore, you're getting more and more watered down every day Sometimes I don't recognize you. I don't recognize you, but my parents' TV only gets picture on channel 5 and 7.

I didn't recognize you

1233,000 results on the web

I don't recognize you

1268,000 results on the web

More popular!

I don't recognize you... but for some reason I don't understand... when I see you shedding tears... my heart aches for you.
I know your face but I don't recognize you.
You look at me so appalled, 'cause I don't recognize you at all.
I don't recognize you, Pandora.
There must be some mistake here. I don't recognize you.
I don't recognize you anymore, you're getting more and more watered down every day
Sometimes I don't recognize you.
I don't recognize you, but my parents' TV only gets picture on channel 5 and 7.