it's not graffiti, it's street art

It's saying that it is graffiti, but it's art

That is true. I just find it annoying when people try to insinuate that it can't be both, which it usually is.

I still maintain that graffiti can be art.

Graffiti can look good yes, but it's still illegal if you don't have permission which is what graffiti is

Are you saying art can't be illegal?

Ok. Graffiti is illegal. It's vandalism. But it can still be beautiful, right?