Like any name calling, it would really depend on what spirit he meant it in.
If he was joking, it's probably best to let it go for now. If it comes up again, politely tell him if it bothers you. Tell him that you like kidding around with him, but that specific thing bothers you, upsets you, feels hateful, or however it is making you feel.
If he is being mean spirited, you can look for an opportunity to tell him, but it may not help. You might want to talk to your mom or other adult you trust to go to him on your behalf.
If he was being serious, like he really thought you might be, then it is time to sit down and talk to him. Tell him what you are ready to tell him. If you are or you aren't, it is up to you to decide when you want to talk about it. Either way, you need to open up communication and tell him how you feel about him calling you a lesbian. Depending on how you feel, you can even politely tell him you think he might have sexist ideas of gender roles, and that you do not believe the same way he does.
When he is calm, tell him it hurt your feelings. Regardless of your sexual orientation, it hurts when people call others by names and labels.
Dad
The best thing to do would be to call her by her name.
no because she isn't
First of all that would be a lesbian: and they would be called Serpents
Lesbian. It's not possible, he would have to be a woman. He may be gay, but not a lesbian. What do you do ? Tell him it doesn't matter and he is still your dad. It's true even if you can't see that at the moment. Doesn't change how he feels about you or how the two of you should interact with each other. It is really no big deal. It is how he is and is supposed to be.
That person would be called a 'butch'.
Try this... your mum is a lesbian and your dad is gay... your an alien!
Paternal- you would say that your dad's dad is your 'paternal grandfather'. Your mother's side would be maternal.
There is no finger that would indicate a lesbian.
That would be your great-aunt, by marriage.
That would be called kissing. It is not either lesbian or gay, but you could be lesbian or gay if you enjoy kissing people who are the same sex as you are.
She would be a lesbian. Also, no one would be a homo. This is a ridiculous, outdated word.