Like you’ll need to hide everything new you got into in fear he’ll yell at you or humiliate you for buying a new game or watching a new show, or even wearing a new shirt. Would you hide that you still celebrate Halloween, Christmas, birthdays, etc despite not being a little kid? Is it normal to go by keyspam usernames and be as anonymous as possible to avoid being found online by your friend as he’ll post private information or hate on all of your posts? While also seeming like the asshole because you’re being secretive for no reason?
In your heart I think you know the answer or you wouldn’t be posting here like this. No, it’s not normal or healthy. That person is not a friend, and he seems dangerous to be around (maybe not for physical reasons but definitely for mental reasons).
Continue to be secretive and distance yourself from him; that’s not asshole behavior, that’s self-preservation. I hope you are able to separate yourself and get free from this person and in time find actual friends who care and support you for who you are.