Why is it gross to you though? What is gross about two men kissing?
I don't find a man and a women kissing gross, or two women kissing gross. Just because I am not aroused by it, doesn't mean it's something I'm adverse to seeing.
The reality is, anyone saying stuff like, "I don't care what you do, I just don't want to see it", in regards to gay signs of affection are in fact imposing their prejudice on others. No one is forcing you to watch gay porn, but when, for example, a show like Game of Thrones shows two dudes in a love scene and certain people start freaking out like they've been forced to be a fluffer in a Falcon production, that is a problem.
Straight displays of affection and sexuality are EVERYWHERE. Literally in all places. Having the prevalence of the same type of content with gay individuals increase is showing that some people are not okay with being exposed to things that do not personally cater to their interests or beliefs, and many of these people feel the need to express these feeling through oppressive comments and/or actions. This is not okay.
Many people feel a variety of hate fueled emotions, that doesn't mean that other people should be subjected to them.