If a ugly person  calls themselves handsome/hot, is that a sign of a grandiose delusion or no.?

Beauty is subjective. 

A person can have an ugly body but a beautiful face. or vice versa.  Some part of an ugly person is beautiful. A person can be ugly but have a fantastic personality.  Look at things from different perspectives & get the bigger picture.

That's just it. And while delusional, they actually think the rest of the world agrees with them! I don't care what they think - to each their own. But when they get nasty/'superior' to other people, I laugh to them and ask them where they buy their mirrors from! The look on their faces is priceless.