It's the truth.
Appearance is just as important as personality when it comes to dating.
Allow me to explain; if you plan on having a romantic relationship with a person, there is a high chance that physical intimacy will be involved (unless you're asexual).
It's extremely difficult to have sexual relations with someone who doesn't appeal to you physically.
This is why it's better to let people down gently if they don't suit your taste; otherwise you risk being trapped in a relationship of lies and toying with your partner's feelings.
Don't get me wrong, a good personality is essential, but taking care of yourself on the outside matters as well.
If you're feeling insecure about your appearance for whatever reason, my advice would be to improve yourself. Try not to rely on the whole "it's what's inside that counts" fairytale; in reality, a person judges you on sight.
Then, if they like what they see, they make an effort to get to know you on a personal level as well.
Both boxes must be ticked.