But let's be real. What the cop and witness were "alarmed" by is that it was by two women. And that's the real problem. This would have never happened to one of the hundreds of thousands of heterosexual couples that vacation/honeymoon in Hawaii that might do the same EXACT same thing.
I think there are two things at play here, one for each side.
1. I think the cop's reaction ( and witness' discomfort ) are specifically tied to seeing a homosexual couple engaging in any form of PDA.
2. I think the couple's reaction to being told to cut it out was initially and immediately hostile, feeling they were singled out for their homesexuality.
While hetero couples may engage in similar behavior, they may also be told to get a room or to cut it out. I doubt that most hetero couples would react as combatively.
I also similarly doubt that the cop would engage a hetero couple in the same situation as aggressively.