When I was younger I dyed my hair a lot and pretty much every color there was. In my personal findings I think that bright/neon colors on fair skin wash that person's color out. I recall a time I had teal hair and it just did not compliment my ashy skin very well and I was going thru an edge phase. Nowadays I'm just a blonde. I will however bleach my eyebrows to be more of a light brown/dark blonde color to better compliment my blonde cause man I hate letting roots grow out.
I don't necesarrily think someone with unnatural hair color is an automatic dangerhair, older people will just assume you're going through a phase lol.