How do I let a guy know i'm not interested when they call you beautiful and the most stunning girl they've ever met?

He is a human being every human being has multiple sides of personality
He is nice in real life but he projects a difference side of his personality online coz he thinks it's OK to do so there, now some guys just make comments on girls to get going he might not be serious about what he said and might have said the same thing to other girls around,
How to show disinterest
That's the easy part reply to all his message taking about another guy you are impressed wirh if you don't have one create a imaginary one unless he is really taking interest in you be will dissappear soon
try messaging him a direct no and unfollow him. if that fails, then ghost him and block him.
Opinion
3Opinion
Pretty sure you just tell him thanks but no thanks. Don't have to be rude but better to get it over with and not drag out.
Just say thanks but no thanks
Just be polite and don't seek out contact
You may need to ghost him
@magiusX26 agreed
You could just say it?
Superb Opinion