I did a bit of reading on the forum and support docs, after watching my saved replay again I decided to put in a protest "for the sake of the community". It wasn't just a tap on the back corner coming out of a turn or some other little "racing incident" type of contact, it was more like an "I'll teach you to slow me down you backmarker!" frustrated bitchslap on an open straight.
Turns out filing a protest is dead easy (now?), basically you just send an email using a simple template they have in the Sporting Code docs and attach replays / screenshots as necessary then wait and see what happens. Probably not much more on my end since I was just a witness to the event, but at least it's out there and hopefully will make some of these loons think a bit more come the next Week 13.
I'm probably still going to try some race a couple of times in the last of the Week 13 Mazda Cup races basically to get some track experience since the last 2 tracks don't look bad. Looking forward to the whatever comes up next season too, hopefully I'll be eligible for some of the Pontiac Solstice and maybe Spec Race Ford stuff (wouldn't mind doing Legends Ford or Street Stock on road tracks either!).