I'm not a fan of PDA either, but this is 2018 and in the public space it happens everywhere. What is your quantification of 'less service'? Did he skip your meal, did you go thirsty, were you blocked from the lav, did they take your meal choice, I just want to know what specific service was lacking? Also, if you had such a problem with service levels inflight, why did you not approach the FA or purser about it? Oh, that's right you were too busy taking pictures with the intention of shaming the couple on FT later. UA's photo policy permits capturing personal events. It is obvious to me that this is not your personal event but one of voyeuristic overtones. Just seems to be not more than homophobic online bullying.