I’ve seen people I wouldn’t consider attractive with partners. Both genders. There might be truth to “beauty is in the eye of the beholder”.
I would say just learn to talk to people. It’s practically the biggest thing. Looks only get you certain people but charisma can get you the right person.
I am a man and I absolutely have given other men compliments. Specifically their shirts if they’re a band I like and I’ve received those too. I am very happy when someone compliments my attire or hair.
I think we should normalize giving each other compliments regardless of gender, as another user said. Of course it shouldn’t be like an exaggerated amount but it would be nice to prop each other up and boost all our confidences. I think that we could tell each other nice things more often. We could certainly be kinder to one another.