Ummm...if he was merging ONTO the freeway the other car DID have the right of way. That's why there are those little upside down triangle signs on ramps that have symbols in them. I think they look like this: Y, I, E, L, and D
Also, "people have no respect for bikers" may stem from the fact that SOME (notice I didn't say ALL) bikers have left a sour taste in their mouth. When a group of guys on crotch rockets and/or harleys wanna roll 147 deep down the road cruisin' 10 miles under the speed limit not letting anyone pass they aren't seen as doing anything wrong (not to mention when they roll through town and at a 4 way stop decide all 147 of them somehow = one vehicle and clog an intersection for 17 hours). When that douche nugget who pulled out in front of me while I was obeying all traffic laws and made me lock up my brakes when HE had the red light he wasn't condemned, even when he punched it and rode a wheelie through traffic eventually cutting through multiple lanes causing many people to swerve or brake. When that biker boy with the do rag matching his bike rides 85 through residential streets where kids play nobody says anything.
It goes both ways. There are some very responsible riders and some complete tool sacks. Same with drivers.
Regardless, he had no reason to throw anything at you. Usually when a bike speeds past me I let 'em go. No way I'm gonna be able to catch/outrun them and there is nothing worth risking everyone elses lives over. The guy obviously thought his Porsche entitled him to do as he pleased and gave him the rights to the road. I'm just glad you came out of it unscathed.
If you have room to get over at ANY onramp/offramp you should do so for the safety of all around you and just as a common courtesy.
I hope you do as you say, find him, and let him know what's up without doing anything stupid that will get you into trouble. Will the cops even do anything now that the situation is in the past?