Is it bad and u healthy to ask for relationship advice online?

My boyfriend told me to ask anyone about a situation we were having a disagreement with, and I don't talk to much people, and he said ask AI, or his cousin or anyone if he was wrong or not, so I asked his cousin, and immediately his cousin started defending him for everything, and questioning me, I felt uncomfortable with that, so I posted the question on reddit and girlsaskguys, got responses of everyone saying he was wrong, and when I sent the screenshots of it all, he got upset and said that I am airing out our dirty laundry to everyone, and why do strangers opinions matter so much, to which I answered that he told me to ask anyone, and I did, and it's not like anyone knows who we are anyway, and he feels it was wrong to do, so am I?
Is it bad and u healthy to ask for relationship advice online?
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