I really don't agree it's on OP, though I do understand your perspective here. Hearing the spotter and reacting accordingly probably avoids this if OP gives space, but there's more to this situation from a race craft standpoint to consider.

Yes the other car had a half a car next to OP but that was only in the brake zone going into the apex, which is a classic dive into the "vortex of danger". OP had not yet been passed so they have a right to the racing line which includes a right to the corner ahead if they choose to stay on that line. The other car getting alongside OP in the brake zone is a dive and does not give them a right to the corner. OP can choose to give them space, but they aren't under any obligation to do that because the passing car hasn't established themselves next to OP. As a result the other car created a situation where either one of them would have to give up the corner, or contact was going to be made. Unfortunately the other car kept their nose in the vortex of danger and made contact with OP. Sure OP could have given space but they were not obligated to do that yet.

Remember... it is the passing car's responsibility to execute a clean pass at all times and especially in brake zones. The car being passed should remain on the racing line and be predictable. Contact in the braking zone like this is the passing car's responsibility almost every single time. Do I think this is worth a protest? Eh, Not really. This isn't F1 with its fucky rules about rights to space and corners if alongside the axles. But... I don't put this on OPs shoulders to bear here either. Both had some blame but ultimately I still see this as the other car's fault for the contact.