What is it to you?

Remember these words.

Confidence: faith or belief that one will act in a right, proper, or effective way.
Modesty: propriety in dress, speech, or conduct.
Self-esteem: confidence and satisfaction in oneself.

When a person compliments your physical appearance, what do you say? Do you think you are beautiful/pretty/handsome/good looking?

You will be judged if you do answer yes, and you will also be judged if you answer no. Answering "yes" would turn you conceited. While answering "no" makes you a liar, you might lack self-esteem and want to fish for compliments. But if you are fishing for compliments, what is to other people? Maybe you need that litany of support and compliments because you were never trained to have a high self-esteem.

If a person thinks that they are, does it harm anyone? If they say, "Yes, I am beautiful and I know it." then let them be. They are confident enough to think that they are beautiful, inside and out. Confidence should be a good thing and should not be taken away from anyone. If they are but say that they are not, it is called being modest. This may not be the case for everyone, yes, but also why does it matter to you?

You do not want their "conceitedness" or their "fishing for compliments attitude"? Then do not pop the question, you may not like the answer.