Yes, that's kind off true. I don't lie to them about having their back, I lie to them about my opinion as I try to avoid conflict. I don't do it against my actual friends, just to people I'm forced to communicate with to function in society.
What is the difference between your friends and your actual friends? Because I thought we were talking about your friends and I also thought that friends are actual friends.
I actually like and help some of my friends, who do respect me, but others, who act like my friends but actually just bully and gaslight me, I just use for my own benefit (usually by pretending to be fine with it). Those assholes could help you, without you having to have any obligations to them.