I don't think the argument has been phrased well by anyone but there is possibly something to it, it's just that 'heebie jeebies' is a really loaded and unhelpful phrase. I think a lot of people insert themselves into the media they watch, so if they are not sexually or romantically interested in men, watching two men kiss may not be a 100% positive experience for them, in the same way that watching two straight people kiss might not be the most engaging experience for a gay person.