Reproval is a good word. In your exemplar sentence, however, you would need to replace towards with of.
I was put off by his reproval of my life choices.
Another--even stronger--word is condemnatory, but again, some word changes would be necessary, as in
I was put off by his condemnatory attitude toward me and my life choices.
Or,
I was put off by his condemnatory attitude about my life choices.
Haughtiness is also a possibility, as in
I was put off by his haughtiness regarding my life choices.
Or,
I was put off by his hauteur regarding my life choices.
And finally, I kind of like the words smug (adjective) and smugness (noun), each of which could be useful and apt.
I was put off by his smugness regarding my life choices.
Or,
I was put off by his smug attitude about my life choices.
And for good measure, here's another short list of possibilities:
arrogance
disdain
contempt
loftiness
superciliousness
contemptuousness