I do think there is an easy way, to avoid having people add things to your hair which make you feel uncomfortable. Simply don't let other people do your hair. But like others here, I highly doubt that the protein product did any damage to your hair.
If it's any consolation, I have hair strands that are almost spiderweb thin, and even my hair has tolerated considerable abuse over the years. Have a look at my hair on my profile, it's hard to see the individual strands. Your hair, which is much stronger than mine, will not fall apart because of a one-time protein conditioner treatment. I've had hair cholesterol added to my hair multiple times in the past (by other people), you can't get much more protein-loaded than that.
I understand your irritation because I don't use protein in my hair, and I wouldn't like it if someone did that to me either. But everything's going to be ok, I'm pretty sure of that.
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