It is normal to feel a bit hurt/down if you get feedback from a senior front-end developer, with the saying that you are still a junior??? I'm a bit confused.

But I know that I'm still a junior(1 year of experience professionally).

Yes. He's beeing condescending, but disguises it as a fact.

I hope one day we will realise that junior != stupid and that senior != genius. For some reason we use the two terms to differentiate between good and bad developers and it makes no sense. It's just a title.

(FYI, my official title includes Senior).

i get that feeling. Im a trainee technically, and my tech lead sometimes treats me like one, but ive been a trainee for coming up to 3 years now.