How do i deal with my parents?

i am a very open minded person..i mean very open. My parents arent super closed minded either. but they say stuff in a joking way where you know its not really joking. they say that when they see gay ppl kissing it grosses them out..and then theyll go on a whole lil spill about gay ppl....well i tell them (by the way we are black) that you dont like when people discriminate against you, so why would you do that to someone else. they said its two different things. what do adults think about this, i would like a variety of ppl answer: gay, straight, old, young. thanks :)