You’re comparing a reaction to something that was common but only recently televised to something that’s extremely uncommon and over-represented in their programming 20x compared with reality.
I think you underestimate how much things have changed to make that claim: it wasn't until 1996 that the majority of Americans approved of interracial marriage. Below 20% of Americans approved of it when the Star Trek kiss aired.
A larger percentage of Republicans support transgender rights today than Americans supported interracial marriage when in 1969. More Americans support transgender rights today than supported it 20 years after the Trek kiss aired.
Interracial relationships weren’t that realistic in the 60s and there were laws in the south against interracial marriage. It wasn’t until the 80s that laws against “sodomy” - ie homosexual relationships - were overturned. It was always those “liberal Hollywood types” pushing an agenda…
A larger percentage of Republicans support transgender rights today than Americans supported interracial marriage when in 1969. More Americans support transgender rights today than supported it 20 years after the Trek kiss aired.