Well, that's your interpretation of what they told you. Reading between the lines there might have been a bit more going on.
They told you you don't know how to use your tools. In other words that you were not being professional. Not that you are not allowed to use other tools. There's a subtle difference. You might think you know best (can't judge that) but your failure is actually convincing others of those amazing abilities and skills you have.
The fact that you are on HN complaining about this, tells me a lot. It's a bit immature behavior and you are burning a few bridges like that. That combined with a few things that maybe didn't go that well in your work in the first weeks would be a gigantic red flag for a manager.
I would recommend not doing acting out in public like this. It's unprofessional. It doesn't matter who is right or wrong. Nobody cares. This is probably a good learning moment for you as well. Somebody didn't see things your way and chose to let you go rather than work with you some more. You might want to reflect on what you could have done differently here.
Anyway, you wouldn't be the first opinionated junior developer that gets a reality check this way. They hired you to do a job and you managed to get yourself fired in 3 weeks. Not a good look. You should thank them for not wasting your time more than that and avoid a repeat of that with whatever you do next.
They told you you don't know how to use your tools. In other words that you were not being professional. Not that you are not allowed to use other tools. There's a subtle difference. You might think you know best (can't judge that) but your failure is actually convincing others of those amazing abilities and skills you have.
The fact that you are on HN complaining about this, tells me a lot. It's a bit immature behavior and you are burning a few bridges like that. That combined with a few things that maybe didn't go that well in your work in the first weeks would be a gigantic red flag for a manager.
I would recommend not doing acting out in public like this. It's unprofessional. It doesn't matter who is right or wrong. Nobody cares. This is probably a good learning moment for you as well. Somebody didn't see things your way and chose to let you go rather than work with you some more. You might want to reflect on what you could have done differently here.
Anyway, you wouldn't be the first opinionated junior developer that gets a reality check this way. They hired you to do a job and you managed to get yourself fired in 3 weeks. Not a good look. You should thank them for not wasting your time more than that and avoid a repeat of that with whatever you do next.