The incoming links won't hurt you in Google, etc., as long as you don't link back.
There is a circumstance in which I do use an .htaccess redirect to send visitors coming from certain web sites away. Some of the web sites I manage offer free gifts (white papers, industrial safety guides, etc.) to encourge people to give out their contact information. Sometimes our site gets listed on a site that lists free giveaways. That brings in non-business people who are just looking for free stuff. So when I see that in our logs, I use the .htaccess file to redirect people coming from those sites to another of our sites. I've not noticed any negative effects in Google resulting from doing this.