Why do some males get upset, or mad, when other males want to look beautiful?

Beauty is not a gender specific trait. 

Sometimes I think the worst threat to this world, the worst threat to peace, are insecure so called heterosexual men who go out of their way to prove to themselves that their sexuality is very flat and absolute. 

Me wanting to look beautiful to self shouldn't be a threat to no one, nor should it be deemed as evil or bad.

There's nothing evil or bad about wanting to look beautiful to self, and or even to others....OK