Getting laughed at in those serious moments is one of my cringe nightmares
If you're with the right partner, they wouldn't be laughing at you. You'd be sharing a humorous moment together.
It's interesting to me to see the reactions from people reading this. My current partner and I routinely laugh and joke and playfully mock each other during sex. And by "during sex" I mean "sometimes literally in mid-thrust". So when I read this comic, I mentally pencil myself and my partner into the scene, and it's exactly the kind of thing we do routinely, so I think it's all sweet and fun and happy. Because if this comic were about me and my partner, we'd laugh and kiss and keep on fuckin'.
Other people, presumably without that experience, only see the embarrassment without seeing the close, positive emotional bond that would allow two people to behave as they do in this comic without the mockery being hostile or malicious.
Reminds me of my ex-wife. She hated being playfully mocked or teased. One day we were visiting some friends who routinely enjoyed playfully mocking and teasing each other, calling each other silly names and expressing (facetious) horrified alarm at the various flaws and failings of the other. And I asked my ex "Why don't we joke around with each other like they do?" She replied "Because I have tissue-paper feelings." And that was that.