I am right-handed and I am a lesbian. These are both traits. One is more meaningful than the other.
Of course. But many things are meaningful. Growing up poor, rich, in a war zone, with a big family, an orphan and so on. These can shape you just as well, if not more. I'm not comparing being a lesbian to having a certain hair color. The environment you live in, the people you surround yourself with, you struggles, all of these build your character. Being stubborn, naive, ruthless or compassionate is merely the product of that. I don't see being a lesbian particularly incident here. Some people might feel differently, but there is no rule. People put emphasis on different things.
So... not a lesbian, and you have 'homosexual friends,' because gay women and gay men are interchangeable in a conversation about whether being a gay woman is meaningful.
Not a lesbian. I don't see the problem. I find being bi is as defining as my gender, my sexual life depends on it but my personality has little to do with that. I have both male and female gay friends, some had to face discrimination and weird behaviors because of it. Some didn't. But I had friends discriminated because of their religion, their skin color, their family's social status. Hell, I was picked on for being tomboyish and a ginger when I was a kid 
There are too many variables to rate how meaningful a trait is, generally. It's subjective.