I would forge ahead. Wool is good for socks because if they get wet they still retain warmth. I don't know if this applies to acrylic yarn specifically, but most athletic socks are made of man-made fibers because cotton retains the moisture.
There are sock experts out there that I'm sure have more personal knowledge, but it seems a shame to frog.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry