That's mostly because Trump isn't incredibly easy to laugh at. He doesn't stand out as extremely stupid, or extremely thin skinned. He's just a guy. Pretty smart, mostly normal. You can't vote a guy in based on how loud and obnoxious his personality is and then act surprised when people laugh at him for being loud and obnoxious. Biden is literally a career politician... The kind that exists for people to watch to feel superior to. So yeah, no shit Trump wouldn't get as many upvotes under a joke title. He's just a normal citizen, aka somebody at least marginally qualified to lead a country. I don't see why being able to take a potential leader seriously should be a point against them.