Perhaps you've not heard Mariah in her prime.
Then again there are people who like to judge people on how they dress, prefer to see insecurities as self obsessession and try and repudiate other people's talents for no reason but to be bitchy for the sake of it or be the dissenting voice… maybe that's you though I'd hope not.
IMO a genius singer and songwriter with vocal chops and musicianship to die for.
She also has a good track record as far as philanthropic efforts are concerned so I think how you view her probably comes down to either misinformation or simply seeing things with a negative bias.