I'm in the delicate position where 6 yearsago I started using Telegram and told a friend and now he doesn't want to move because I "should have told him to use

I'm in the delicate position where 6 yearsago I started using Telegram and told a friend and now he doesn't want to move because I "should have told him to use signal and I have moved all my friends to Telegram and they wouldn't understand and Signal desktop has memory leaks and I don't like it anyway". The guy nagging people with Linux ten years ago. Anyway.